图书管理之HTML5压缩旋转裁剪图片总结

2022-10-20 11:33:34

整体思路  ：

在移动端压缩图片并且上传主要用到filereader、canvas 以及 formdata 这三个h5的api。逻辑并不难。整个过程就是：

　　（1）用户使用input file上传图片的时候，用filereader读取用户上传的图片数据（base64格式）

　　（2）把图片数据传入img对象，然后将img绘制到canvas上，再调用canvas.toDataURL对图片进行压缩

　　（3）利用copper.js组件进行图片的裁剪旋转处理

　　（4）获取到压缩后的base64格式图片数据，转成二进制塞入formdata，再通过XmlHttpRequest提交formdata。、

　　说起来好像挺简单，其实还是有些坑的。接下来就直接用代码进行分析：

1）先是获取图片数据，也就是监听input file的change事件，然后获取到上传的文件对象files，将类数组的files转成数组，然后进行forEach遍历。

　　先了解一个方法  fileReader

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" 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" alt="" />

　

　　2）接着判断文件类型，如果不是图片则不作处理。如果是图片就实例化一个filereader，以base64格式读取上传的文件数据，判断数据长度，如果大于200KB的图片就调用compress方法进行压缩，否则调用upload方法进行上传。

　　　　//在我做的项目中并没有判断图片大小进行分别处理

【2】压缩图片

　　上面做完图片数据的获取后，就可以做compress压缩图片的方法了。而压缩图片也并不是直接把图片绘制到canvas再调用一下toDataURL就行的。

　　在IOS中，canvas绘制图片是有两个限制的：

　　首先是图片的大小，如果图片的大小超过两百万像素，图片也是无法绘制到canvas上的，调用drawImage的时候不会报错，但是你用toDataURL获取图片数据的时候获取到的是空的图片数据。

　　再者就是canvas的大小有限制，如果canvas的大小大于大概五百万像素（即宽高乘积）的时候，不仅图片画不出来，其他什么东西也都是画不出来的。

　　应对第一种限制，处理办法就是瓦片绘制了。瓦片绘制，也就是将图片分割成多块绘制到canvas上，我代码里的做法是把图片分割成100万像素一块的大小，再绘制到canvas上。

　　而应对第二种限制，我的处理办法是对图片的宽高进行适当压缩，我代码里为了保险起见，设的上限是四百万像素，如果图片大于四百万像素就压缩到小于四百万像素。四百万像素的图片应该够了，算起来宽高都有2000X2000了。

　　如此一来就解决了IOS上的两种限制了。

　　除了上面所述的限制，还有两个坑，一个就是canvas的toDataURL是只能压缩jpg的，当用户上传的图片是png的话，就需要转成 jpg，也就是统一用canvas.toDataURL('image/jpeg', 0.1) ， 类型统一设成jpeg，而压缩比就自己控制了。

　　另一个就是如果是png转jpg，绘制到canvas上的时候，canvas存在透明区域的话，当转成jpg的时候透明区域会变成黑色，因为 canvas的透明像素默认为rgba(0,0,0,0)，所以转成jpg就变成rgba(0,0,0,1)了，也就是透明背景会变成了黑色。解决办法就 是绘制之前在canvas上铺一层白色的底色。

function compress(img) {

        var initSize = img.src.length;

        var width = img.width;

        var height = img.height;

        //如果图片大于四百万像素，计算压缩比并将大小压至400万以下

        var ratio;

        if ((ratio = width * height / 4000000)>1) {

            ratio = Math.sqrt(ratio);

            width /= ratio;

            height /= ratio;

        }else {

            ratio = 1;

        }

        canvas.width = width;

        canvas.height = height;

//        铺底色

        ctx.fillStyle = "#fff";

        ctx.fillRect(0, 0, canvas.width, canvas.height);

        //如果图片像素大于100万则使用瓦片绘制

        var count;

        if ((count = width * height / 1000000) > 1) {

            count = ~~(Math.sqrt(count)+1); //计算要分成多少块瓦片

//            计算每块瓦片的宽和高

            var nw = ~~(width / count);

            var nh = ~~(height / count);

            tCanvas.width = nw;

            tCanvas.height = nh;

            for (var i = 0; i < count; i++) {

                for (var j = 0; j < count; j++) {

                    tctx.drawImage(img, i * nw * ratio, j * nh * ratio, nw * ratio, nh * ratio, 0, 0, nw, nh);

                    ctx.drawImage(tCanvas, i * nw, j * nh, nw, nh);

                }

            }

        } else {

            ctx.drawImage(img, 0, 0, width, height);

        }

        //进行最小压缩

        var ndata = canvas.toDataURL('image/jpeg', 0.1);

        console.log('压缩前：' + initSize);

        console.log('压缩后：' + ndata.length);

        console.log('压缩率：' + ~~(100 * (initSize - ndata.length) / initSize) + "%");

        tCanvas.width = tCanvas.height = canvas.width = canvas.height = 0;

        return ndata;

    }

//这里是在别人的博客上面找到的方法  有效的解决了 IOS微信图片压缩后数据量翻倍的问题

下面是我的项目代码
<!DOCTYPE html>

<html lang="zh-cn">

<head>

    <!--定义 title keywords description信息 start-->

    <title>图书管理</title>

    <meta name="keywords" content=""/>

    <meta name="description" content=""/>

    <!--定义 title keywords description信息  end-->

    <!-- 定义文档类型 视口信息 start-->

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

    <link rel="stylesheet" type="text/css" href="css/reset.css"/>

    <link rel="stylesheet" type="text/css" href="css/common.css" />

    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=2.0, user-scalable=yes" />

</head>

<body>

<div class="main-wrap">

    <header class="headerTop">

        <h3>我要分享</h3>

    </header>

    <div class="bookBg">

        <img src="img/bookBg.png" width="640" height="248">

    </div>

    <div class="cont">

        <form action="" method="" class="form">

            <div class="form-sub"><label>姓名&nbsp;:</label><input type="text" id="name" class="text"></div>

            <div class="form-sub mbn">

                <label>分类&nbsp;:</label>

                <select id="type" class="select">

                    <option value="1">开发语言</option>

                    <option value="2">数据库</option>

                    <option value="3">操作系统</option>

                    <option value="4">前端</option>

                    <option value="5" selected>综合</option>

                </select>

            </div>

            <div class="form-txt">

                <textarea id="word" class="text2">简介</textarea>

            </div>

            <ul id="preview">

                <li><img src="img/get1.png"></li>

                <li><img src="img/get.png"><input type="hidden"></li>

                <li><img src="img/get.png"><input type="hidden"></li>

                <li><img src="img/get.png"><input type="hidden"></li>

                <li><img src="img/get.png"><input type="hidden"></li>

                <li><img src="img/get.png"><input type="hidden"></li>

            </ul>

            <button type="button" id="submit" class="button">确认分享</button>

        </form>

    </div> 

    <div class="tan tan-co">

        <div class="file-box">

            <div class="fileTxt">

                <label>选取图片：</label>

                <div>

                    <button>选择文件</button>

                   <input type="file" id="getImg">

                </div>

            </div>

            <span id="close"></span>

        </div>

        <div class="img-wp"></div>

        <div class="img-btn">

            <p>

                <button class="rotate rotate-L" id="rotate-L"></button>

                <button class="sure" id="sure"></button>

                <button class="rotate rotate-R" id="rotate-R"></button>

            </p>

        </div>

    </div>  

    <footer class="footer">

        <a href=""><em></em>图书名单</a>

        <a href=""><em></em>已借图书</a>

        <a href="" class="cur"><em></em>我要分享</a>

    </footer>

</div>

<script type="text/javascript" src="js/jquery-1.11.0.min.js"></script>

<script type="text/javascript" src="js/jy.js"></script>

<script type="text/javascript" src="js/cropper.js"></script>

<script type="text/javascript">

$(function(){

    var box=$(".img-wp");

    var img=null;

    var i=null;

    //var imgURL;

    function init(){

        var w=$(window).width();

        var h=$(window).height();

        $('.tan-co').width(w).height(h);

        $('.img-wp').width(w-20).height(h-120);

    };

    init();

    $('#preview li:gt(0)').click(function(){

        i=$(this).index();

        $('.tan').show();

        $('#getImg').change(function(){

            var files,file,url;

            files=$(this).prop('files');

            if(files.length>0){

                file = files[0];  //上传按钮上传的一个对象

                if(isImageFile(file)){  //判断是否是图片

                    url = createObjectURLfun(file);

                }else{

                    $('.img-wp').html('您选择的不是图片文件！请重新选择！！');

                };

            };

            startCropper(url,i);

        });

    });

    function startCropper(url,i){  //准备裁剪

        img=$('<img src="' + url + '">');

        box.empty().html(img);  //先清空在放置图片

        img.cropper({aspectRatio:2/3});

        //图片的压缩速率

    }

    $('#sure').click(function(){

        if(img){

            var c=img.cropper("getCroppedCanvas");

            //获得图片base64的数据

            var imgsrc=c.toDataURL("image/jpeg",0.5);    //base64位的数据

            $('#preview li:eq('+i+') img').attr({'src':imgsrc});

            $('#preview li:eq('+i+') input').val(imgsrc);

            $('#getImg').val('');

            $('.img-wp').empty();

            $('.tan').hide();

            img=null;

            c=null;

        }

    });

    $('#rotate-L').click(function(){

        if(img){

          img.cropper("rotate", -90);

        }

    });

    $('#rotate-R').click(function(){

        if(img){

          img.cropper("rotate", 90);

        }

    });

    function isImageFile(file){  //判断是否是图片

        if (file.type) {

          return /^image\/\w+$/.test(file.type);

        } else {

          return /\.(jpg|jpeg|png|gif)$/.test(file);

        }

    }

    $('#close').click(function(){

        $('#getImg').val('');

        $('.img-wp').empty();

        $('.tan').hide();

    });

    $('#submit').click(function(){

        var name=$('#name').val();

        var book=$('#book').val();

        var type=$('#type option:selected').val();

        var word=$('#word').val();

        var pic1=$('#preview li:eq(1) input').val();

        var pic2=$('#preview li:eq(2) input').val();

        var pic3=$('#preview li:eq(3) input').val();

        var pic4=$('#preview li:eq(4) input').val();

        var pic5=$('#preview li:eq(5) input').val();

    });

    createObjectURLfun = function(file) {

        if (window.navigator.userAgent.indexOf("Chrome") >= 1 || window.navigator.userAgent.indexOf("Safari") >= 1) {

            return window.webkitURL.createObjectURL(file);

        } else {

            return window.URL.createObjectURL(file);

        };

    };

});

</script>

</body>

</html>
/*!

 * Cropper v0.9.2

 * https://github.com/fengyuanchen/cropper

 *

 * Copyright (c) 2014-2015 Fengyuan Chen and contributors

 * Released under the MIT license

 *

 * Date: 2015-04-18T04:35:01.500Z

 */

(function (factory) {

  if (typeof define === 'function' && define.amd) {

    // AMD. Register as anonymous module.

    define(['jquery'], factory);

  } else if (typeof exports === 'object') {

    // Node / CommonJS

    factory(require('jquery'));

  } else {

    // Browser globals.

    factory(jQuery);

  }

})(function ($) {

  'use strict';

  var $window = $(window),

      $document = $(document),

      location = window.location,

      // Constants

      CROPPER_NAMESPACE = '.cropper',

      CROPPER_PREVIEW = 'preview' + CROPPER_NAMESPACE,

      // RegExps

      REGEXP_DRAG_TYPES = /^(e|n|w|s|ne|nw|sw|se|all|crop|move|zoom)$/,

      // Classes

      CLASS_MODAL = 'cropper-modal',

      CLASS_HIDE = 'cropper-hide',

      CLASS_HIDDEN = 'cropper-hidden',

      CLASS_INVISIBLE = 'cropper-invisible',

      CLASS_MOVE = 'cropper-move',

      CLASS_CROP = 'cropper-crop',

      CLASS_DISABLED = 'cropper-disabled',

      CLASS_BG = 'cropper-bg',

      // Events

      EVENT_MOUSE_DOWN = 'mousedown touchstart',

      EVENT_MOUSE_MOVE = 'mousemove touchmove',

      EVENT_MOUSE_UP = 'mouseup mouseleave touchend touchleave touchcancel',

      EVENT_WHEEL = 'wheel mousewheel DOMMouseScroll',

      EVENT_DBLCLICK = 'dblclick',

      EVENT_RESIZE = 'resize' + CROPPER_NAMESPACE, // Bind to window with namespace

      EVENT_BUILD = 'build' + CROPPER_NAMESPACE,

      EVENT_BUILT = 'built' + CROPPER_NAMESPACE,

      EVENT_DRAG_START = 'dragstart' + CROPPER_NAMESPACE,

      EVENT_DRAG_MOVE = 'dragmove' + CROPPER_NAMESPACE,

      EVENT_DRAG_END = 'dragend' + CROPPER_NAMESPACE,

      EVENT_ZOOM_IN = 'zoomin' + CROPPER_NAMESPACE,

      EVENT_ZOOM_OUT = 'zoomout' + CROPPER_NAMESPACE,

      // Supports

      SUPPORT_CANVAS = $.isFunction($('<canvas>')[0].getContext),

      // Others

      sqrt = Math.sqrt,

      min = Math.min,

      max = Math.max,

      abs = Math.abs,

      sin = Math.sin,

      cos = Math.cos,

      num = parseFloat,

      // Prototype

      prototype = {};

  function isNumber(n) {

    return typeof n === 'number';

  }

  function isUndefined(n) {

    return typeof n === 'undefined';

  }

  function toArray(obj, offset) {

    var args = [];

    if (isNumber(offset)) { // It's necessary for IE8

      args.push(offset);

    }

    return args.slice.apply(obj, args);

  }

  // Custom proxy to avoid jQuery's guid

  function proxy(fn, context) {

    var args = toArray(arguments, 2);

    return function () {

      return fn.apply(context, args.concat(toArray(arguments)));

    };

  }

  function isCrossOriginURL(url) {

    var parts = url.match(/^(https?:)\/\/([^\:\/\?#]+):?(\d*)/i);

    return parts && (parts[1] !== location.protocol || parts[2] !== location.hostname || parts[3] !== location.port);

  }

  function addTimestamp(url) {  //加上时间搓

    var timestamp = 'timestamp=' + (new Date()).getTime();

    return (url + (url.indexOf('?') === -1 ? '?' : '&') + timestamp);

  }

  function inRange(source, target) {  //是否在范围内

    return target.left < 0 && source.width < (target.left + target.width) && target.top < 0 && source.height < (target.top + target.height);

  }

  function getRotateValue(degree) {  //获取旋转的角度

    return degree ? 'rotate(' + degree + 'deg)' : 'none';

  }

  function getRotatedSizes(data, reverse) {

    var deg = abs(data.degree) % 180,

        arc = (deg > 90 ? (180 - deg) : deg) * Math.PI / 180,

        sinArc = sin(arc),

        cosArc = cos(arc),

        width = data.width,

        height = data.height,

        aspectRatio = data.aspectRatio,

        newWidth,

        newHeight;

		if (!reverse) { //如果反向的话

		  newWidth = width * cosArc + height * sinArc;

		  newHeight = width * sinArc + height * cosArc;

		} else {

		  newWidth = width / (cosArc + sinArc / aspectRatio);

		  newHeight = newWidth / aspectRatio;

		}

		return {

		  width: newWidth,

		  height: newHeight

		};

  }

  function getSourceCanvas(image, data) {

    var canvas = $('<canvas>')[0],

        context = canvas.getContext('2d'),

        width = data.naturalWidth,

        height = data.naturalHeight,

        rotate = data.rotate,

        rotated = getRotatedSizes({

          width: width,

          height: height,

          degree: rotate

        });

    if (rotate) {

      canvas.width = rotated.width;

      canvas.height = rotated.height;

      context.save();

      context.translate(rotated.width / 2, rotated.height / 2);

      context.rotate(rotate * Math.PI / 180);

      context.drawImage(image, -width / 2, -height / 2, width, height);

      context.restore();

    } else {

      canvas.width = width;

      canvas.height = height;

      context.drawImage(image, 0, 0, width, height);

    }

    return canvas;

  }

  function Cropper(element, options) {

    this.$element = $(element);

    this.options = $.extend({}, Cropper.DEFAULTS, $.isPlainObject(options) && options);

    this.ready = false;

    this.built = false;

    this.rotated = false;

    this.cropped = false;

    this.disabled = false;

    this.canvas = null;

    this.cropBox = null;

    this.load();

  }

  prototype.load = function (url) {

    var options = this.options,

        $this = this.$element,

        crossOrigin,

        bustCacheUrl,

        buildEvent,

        $clone;

    if (!url) {

      if ($this.is('img')) {

        if (!$this.attr('src')) { //没有src属性 就返回

          return;

        }

        url = $this.prop('src');

		//什么时候使用attr()，什么时候使用prop()？

		//1.添加属性名称该属性就会生效应该使用prop();

		//2.是有true,false两个属性使用prop();

		//3.其他则使用attr();

      } else if ($this.is('canvas') && SUPPORT_CANVAS) {  //是画布并且支持画布

		url =compress($this[0]);

      }

    }

    if (!url) { //如果找不到地址 就返回

      return;

    }

    buildEvent = $.Event(EVENT_BUILD);

    $this.one(EVENT_BUILD, options.build).trigger(buildEvent); // Only trigger once

    if (buildEvent.isDefaultPrevented()) {

      return;

    }

    if (options.checkImageOrigin && isCrossOriginURL(url)) {

      crossOrigin = 'anonymous';

      if (!$this.prop('crossOrigin')) { // Only when there was not a "crossOrigin" property  只有当没有“crossOrigin”属性

        bustCacheUrl = addTimestamp(url); // Bust cache (#148)

      }

    }

    this.$clone = $clone = $('<img>');

    $clone.one('load', $.proxy(function () {

      var naturalWidth = $clone.prop('naturalWidth') || $clone.width(),

          naturalHeight = $clone.prop('naturalHeight') || $clone.height();

      this.image = {

        naturalWidth: naturalWidth,

        naturalHeight: naturalHeight,

        aspectRatio: naturalWidth / naturalHeight,

        rotate: 0

      };

      this.url = url;

      this.ready = true;

      this.build();

    }, this)).one('error', function () {

      $clone.remove();

    }).attr({

      src: bustCacheUrl || url,

      crossOrigin: crossOrigin

    });

    // Hide and insert into the document

    $clone.addClass(CLASS_HIDE).insertAfter($this);

  };

  prototype.build = function () {

    var $this = this.$element,

        $clone = this.$clone,

        options = this.options,

        $cropper,

        $cropBox;

    if (!this.ready) {

      return;

    }

    if (this.built) {

      this.unbuild();

    }

    // Create cropper elements

    this.$cropper = $cropper = $(Cropper.TEMPLATE);

    // Hide the original image

    $this.addClass(CLASS_HIDDEN);

    // Show the clone iamge

    $clone.removeClass(CLASS_HIDE);

    this.$container = $this.parent().append($cropper);

    this.$canvas = $cropper.find('.cropper-canvas').append($clone);

    this.$dragBox = $cropper.find('.cropper-drag-box');

    this.$cropBox = $cropBox = $cropper.find('.cropper-crop-box');

    this.$viewBox = $cropper.find('.cropper-view-box');

    this.addListeners();

    this.initPreview();

    // Format aspect ratio

    options.aspectRatio = num(options.aspectRatio) || NaN; // 0 -> NaN

    if (options.autoCrop) {

      this.cropped = true;

      if (options.modal) {

        this.$dragBox.addClass(CLASS_MODAL);

      }

    } else {

      $cropBox.addClass(CLASS_HIDDEN);

    }

    if (options.background) {

      $cropper.addClass(CLASS_BG);

    }

    if (!options.highlight) {

      $cropBox.find('.cropper-face').addClass(CLASS_INVISIBLE);

    }

    if (!options.guides) {

      $cropBox.find('.cropper-dashed').addClass(CLASS_HIDDEN);

    }

    if (!options.movable) {

      $cropBox.find('.cropper-face').data('drag', 'move');

    }

    if (!options.resizable) {

      $cropBox.find('.cropper-line, .cropper-point').addClass(CLASS_HIDDEN);

    }

    this.setDragMode(options.dragCrop ? 'crop' : 'move');

    this.built = true;

    this.render();

    $this.one(EVENT_BUILT, options.built).trigger(EVENT_BUILT); // Only trigger once

  };

  prototype.unbuild = function () {

    if (!this.built) {

      return;

    }

    this.built = false;

    this.container = null;

    this.canvas = null;

    this.cropBox = null; // This is necessary when replace

    this.removeListeners();

    this.resetPreview();

    this.$preview = null;

    this.$viewBox = null;

    this.$cropBox = null;

    this.$dragBox = null;

    this.$canvas = null;

    this.$container = null;

    this.$cropper.remove();

    this.$cropper = null;

  };

  $.extend(prototype, {

    render: function () {

      this.initContainer();

      this.initCanvas();

      this.initCropBox();

      this.renderCanvas();

      if (this.cropped) {

        this.renderCropBox();

      }

    },

    initContainer: function () {

      var $this = this.$element,

          $container = this.$container,

          $cropper = this.$cropper,

          options = this.options;

      $cropper.addClass(CLASS_HIDDEN);

      $this.removeClass(CLASS_HIDDEN);

      $cropper.css((this.container = {

        width: max($container.width(), num(options.minContainerWidth) || 200),

        height: max($container.height(), num(options.minContainerHeight) || 100)

      }));

      $this.addClass(CLASS_HIDDEN);

      $cropper.removeClass(CLASS_HIDDEN);

    },

    // image box (wrapper)

    initCanvas: function () {

      var container = this.container,

          containerWidth = container.width,

          containerHeight = container.height,

          image = this.image,

          aspectRatio = image.aspectRatio,

          canvas = {

            aspectRatio: aspectRatio,

            width: containerWidth,

            height: containerHeight

          };

      if (containerHeight * aspectRatio > containerWidth) {

        canvas.height = containerWidth / aspectRatio;

      } else {

        canvas.width = containerHeight * aspectRatio;

      }

      canvas.oldLeft = canvas.left = (containerWidth - canvas.width) / 2;

      canvas.oldTop = canvas.top = (containerHeight - canvas.height) / 2;

      this.canvas = canvas;

      this.limitCanvas(true, true);

      this.initialImage = $.extend({}, image);

      this.initialCanvas = $.extend({}, canvas);

    },

    limitCanvas: function (size, position) {

      var options = this.options,

          strict = options.strict,

          container = this.container,

          containerWidth = container.width,

          containerHeight = container.height,

          canvas = this.canvas,

          aspectRatio = canvas.aspectRatio,

          cropBox = this.cropBox,

          cropped = this.cropped && cropBox,

          minCanvasWidth,

          minCanvasHeight;

      if (size) {

        minCanvasWidth = num(options.minCanvasWidth) || 0;

        minCanvasHeight = num(options.minCanvasHeight) || 0;

        if (minCanvasWidth) {

          if (strict) {

            minCanvasWidth = max(cropped ? cropBox.width : containerWidth, minCanvasWidth);

          }

          minCanvasHeight = minCanvasWidth / aspectRatio;

        } else if (minCanvasHeight) {

          if (strict) {

            minCanvasHeight = max(cropped ? cropBox.height : containerHeight, minCanvasHeight);

          }

          minCanvasWidth = minCanvasHeight * aspectRatio;

        } else if (strict) {

          if (cropped) {

            minCanvasWidth = cropBox.width;

            minCanvasHeight = cropBox.height;

            if (minCanvasHeight * aspectRatio > minCanvasWidth) {

              minCanvasWidth = minCanvasHeight * aspectRatio;

            } else {

              minCanvasHeight = minCanvasWidth / aspectRatio;

            }

          } else {

            minCanvasWidth = containerWidth;

            minCanvasHeight = containerHeight;

            if (minCanvasHeight * aspectRatio > minCanvasWidth) {

              minCanvasHeight = minCanvasWidth / aspectRatio;

            } else {

              minCanvasWidth = minCanvasHeight * aspectRatio;

            }

          }

        }

        $.extend(canvas, {

          minWidth: minCanvasWidth,

          minHeight: minCanvasHeight,

          maxWidth: Infinity,

          maxHeight: Infinity

        });

      }

      if (position) {

        if (strict) {

          if (cropped) {

            canvas.minLeft = min(cropBox.left, (cropBox.left + cropBox.width) - canvas.width);

            canvas.minTop = min(cropBox.top, (cropBox.top + cropBox.height) - canvas.height);

            canvas.maxLeft = cropBox.left;

            canvas.maxTop = cropBox.top;

          } else {

            canvas.minLeft = min(0, containerWidth - canvas.width);

            canvas.minTop = min(0, containerHeight - canvas.height);

            canvas.maxLeft = max(0, containerWidth - canvas.width);

            canvas.maxTop = max(0, containerHeight - canvas.height);

          }

        } else {

          canvas.minLeft = -canvas.width;

          canvas.minTop = -canvas.height;

          canvas.maxLeft = containerWidth;

          canvas.maxTop = containerHeight;

        }

      }

    },

    renderCanvas: function (changed) {

      var options = this.options,

          canvas = this.canvas,

          image = this.image,

          aspectRatio,

          rotated;

      if (this.rotated) {

        this.rotated = false;

        // Computes rotatation sizes with image sizes

        rotated = getRotatedSizes({

          width: image.width,

          height: image.height,

          degree: image.rotate

        });

        aspectRatio = rotated.width / rotated.height;

        if (aspectRatio !== canvas.aspectRatio) {

          canvas.left -= (rotated.width - canvas.width) / 2;

          canvas.top -= (rotated.height - canvas.height) / 2;

          canvas.width = rotated.width;

          canvas.height = rotated.height;

          canvas.aspectRatio = aspectRatio;

          this.limitCanvas(true, false);

        }

      }

      if (canvas.width > canvas.maxWidth || canvas.width < canvas.minWidth) {

        canvas.left = canvas.oldLeft;

      }

      if (canvas.height > canvas.maxHeight || canvas.height < canvas.minHeight) {

        canvas.top = canvas.oldTop;

      }

      canvas.width = min(max(canvas.width, canvas.minWidth), canvas.maxWidth);

      canvas.height = min(max(canvas.height, canvas.minHeight), canvas.maxHeight);

      this.limitCanvas(false, true);

      canvas.oldLeft = canvas.left = min(max(canvas.left, canvas.minLeft), canvas.maxLeft);

      canvas.oldTop = canvas.top = min(max(canvas.top, canvas.minTop), canvas.maxTop);

      this.$canvas.css({

        width: canvas.width,

        height: canvas.height,

        left: canvas.left,

        top: canvas.top

      });

      this.renderImage();

      if (this.cropped && options.strict && !inRange(this.container, canvas)) {

        this.limitCropBox(true, true);

      }

      if (changed) {

        this.output();

      }

    },

    renderImage: function () {

      var canvas = this.canvas,

          image = this.image,

          reversed;

      if (image.rotate) {

        reversed = getRotatedSizes({

          width: canvas.width,

          height: canvas.height,

          degree: image.rotate,

          aspectRatio: image.aspectRatio

        }, true);

      }

      $.extend(image, reversed ? {

        width: reversed.width,

        height: reversed.height,

        left: (canvas.width - reversed.width) / 2,

        top: (canvas.height - reversed.height) / 2

      } : {

        width: canvas.width,

        height: canvas.height,

        left: 0,

        top: 0

      });

      this.$clone.css({

        width: image.width,

        height: image.height,

        marginLeft: image.left,

        marginTop: image.top,

        transform: getRotateValue(image.rotate)

      });

    },

    initCropBox: function () {

      var options = this.options,

          canvas = this.canvas,

          aspectRatio = options.aspectRatio,

          autoCropArea = num(options.autoCropArea) || 0.8,

          cropBox = {

            width: canvas.width,

            height: canvas.height

          };

      if (aspectRatio) {

        if (canvas.height * aspectRatio > canvas.width) {

          cropBox.height = cropBox.width / aspectRatio;

        } else {

          cropBox.width = cropBox.height * aspectRatio;

        }

      }

      this.cropBox = cropBox;

      this.limitCropBox(true, true);

      // Initialize auto crop area

      cropBox.width = min(max(cropBox.width, cropBox.minWidth), cropBox.maxWidth);

      cropBox.height = min(max(cropBox.height, cropBox.minHeight), cropBox.maxHeight);

      // The width of auto crop area must large than "minWidth", and the height too. (#164)

      cropBox.width = max(cropBox.minWidth, cropBox.width * autoCropArea);

      cropBox.height = max(cropBox.minHeight, cropBox.height * autoCropArea);

      cropBox.oldLeft = cropBox.left = canvas.left + (canvas.width - cropBox.width) / 2;

      cropBox.oldTop = cropBox.top = canvas.top + (canvas.height - cropBox.height) / 2;

      this.initialCropBox = $.extend({}, cropBox);

    },

    limitCropBox: function (size, position) {

      var options = this.options,

          strict = options.strict,

          container = this.container,

          containerWidth = container.width,

          containerHeight = container.height,

          canvas = this.canvas,

          cropBox = this.cropBox,

          aspectRatio = options.aspectRatio,

          minCropBoxWidth,

          minCropBoxHeight;

      if (size) {

        minCropBoxWidth = num(options.minCropBoxWidth) || 0;

        minCropBoxHeight = num(options.minCropBoxHeight) || 0;

        // min/maxCropBoxWidth/Height must less than conatiner width/height

        cropBox.minWidth = min(containerWidth, minCropBoxWidth);

        cropBox.minHeight = min(containerHeight, minCropBoxHeight);

        cropBox.maxWidth = min(containerWidth, strict ? canvas.width : containerWidth);

        cropBox.maxHeight = min(containerHeight, strict ? canvas.height : containerHeight);

        if (aspectRatio) {

          // compare crop box size with container first

          if (cropBox.maxHeight * aspectRatio > cropBox.maxWidth) {

            cropBox.minHeight = cropBox.minWidth / aspectRatio;

            cropBox.maxHeight = cropBox.maxWidth / aspectRatio;

          } else {

            cropBox.minWidth = cropBox.minHeight * aspectRatio;

            cropBox.maxWidth = cropBox.maxHeight * aspectRatio;

          }

        }

        // The "minWidth" must be less than "maxWidth", and the "minHeight" too.

        cropBox.minWidth = min(cropBox.maxWidth, cropBox.minWidth);

        cropBox.minHeight = min(cropBox.maxHeight, cropBox.minHeight);

      }

      if (position) {

        if (strict) {

          cropBox.minLeft = max(0, canvas.left);

          cropBox.minTop = max(0, canvas.top);

          cropBox.maxLeft = min(containerWidth, canvas.left + canvas.width) - cropBox.width;

          cropBox.maxTop = min(containerHeight, canvas.top + canvas.height) - cropBox.height;

        } else {

          cropBox.minLeft = 0;

          cropBox.minTop = 0;

          cropBox.maxLeft = containerWidth - cropBox.width;

          cropBox.maxTop = containerHeight - cropBox.height;

        }

      }

    },

    renderCropBox: function () {

      var options = this.options,

          container = this.container,

          containerWidth = container.width,

          containerHeight = container.height,

          $cropBox = this.$cropBox,

          cropBox = this.cropBox;

      if (cropBox.width > cropBox.maxWidth || cropBox.width < cropBox.minWidth) {

        cropBox.left = cropBox.oldLeft;

      }

      if (cropBox.height > cropBox.maxHeight || cropBox.height < cropBox.minHeight) {

        cropBox.top = cropBox.oldTop;

      }

      cropBox.width = min(max(cropBox.width, cropBox.minWidth), cropBox.maxWidth);

      cropBox.height = min(max(cropBox.height, cropBox.minHeight), cropBox.maxHeight);

      this.limitCropBox(false, true);

      cropBox.oldLeft = cropBox.left = min(max(cropBox.left, cropBox.minLeft), cropBox.maxLeft);

      cropBox.oldTop = cropBox.top = min(max(cropBox.top, cropBox.minTop), cropBox.maxTop);

      if (options.movable) {

        $cropBox.find('.cropper-face').data('drag', (cropBox.width === containerWidth && cropBox.height === containerHeight) ? 'move' : 'all');

      }

      $cropBox.css({

        width: cropBox.width,

        height: cropBox.height,

        left: cropBox.left,

        top: cropBox.top

      });

      if (this.cropped && options.strict && !inRange(container, this.canvas)) {

        this.limitCanvas(true, true);

      }

      if (!this.disabled) {

        this.output();

      }

    },

    output: function () {

      var options = this.options;

      this.preview();

      if (options.crop) {

        options.crop.call(this.$element, this.getData());

      }

    }

  });

  prototype.initPreview = function () {

    var url = this.url;

    this.$preview = $(this.options.preview);

    this.$viewBox.html('<img src="' + url + '">');

    // Override img element styles

    // Add `display:block` to avoid margin top issue (Occur only when margin-top <= -height)

    this.$preview.each(function () {

      var $this = $(this);

      $this.data(CROPPER_PREVIEW, {

        width: $this.width(),

        height: $this.height(),

        original: $this.html()

      }).html('<img src="' + url + '" style="display:block;width:100%;min-width:0!important;min-height:0!important;max-width:none!important;max-height:none!important;image-orientation: 0deg!important">');

    });

  };

  prototype.resetPreview = function () {

    this.$preview.each(function () {

      var $this = $(this);

      $this.html($this.data(CROPPER_PREVIEW).original).removeData(CROPPER_PREVIEW);

    });

  };

  prototype.preview = function () {

    var image = this.image,

        canvas = this.canvas,

        cropBox = this.cropBox,

        width = image.width,

        height = image.height,

        left = cropBox.left - canvas.left - image.left,

        top = cropBox.top - canvas.top - image.top,

        rotate = image.rotate;

    if (!this.cropped || this.disabled) {

      return;

    }

    this.$viewBox.find('img').css({

      width: width,

      height: height,

      marginLeft: -left,

      marginTop: -top,

      transform: getRotateValue(rotate)

    });

    this.$preview.each(function () {

      var $this = $(this),

          data = $this.data(CROPPER_PREVIEW),

          ratio = data.width / cropBox.width,

          newWidth = data.width,

          newHeight = cropBox.height * ratio;

      if (newHeight > data.height) {

        ratio = data.height / cropBox.height;

        newWidth = cropBox.width * ratio;

        newHeight = data.height;

      }

      $this.width(newWidth).height(newHeight).find('img').css({

        width: width * ratio,

        height: height * ratio,

        marginLeft: -left * ratio,

        marginTop: -top * ratio,

        transform: getRotateValue(rotate)

      });

    });

  };

  prototype.addListeners = function () {

    var options = this.options;

    this.$element.on(EVENT_DRAG_START, options.dragstart).on(EVENT_DRAG_MOVE, options.dragmove).on(EVENT_DRAG_END, options.dragend).on(EVENT_ZOOM_IN, options.zoomin).on(EVENT_ZOOM_OUT, options.zoomout);

    this.$cropper.on(EVENT_MOUSE_DOWN, $.proxy(this.dragstart, this)).on(EVENT_DBLCLICK, $.proxy(this.dblclick, this));

    if (options.zoomable && options.mouseWheelZoom) {

      this.$cropper.on(EVENT_WHEEL, $.proxy(this.wheel, this));

    }

    $document.on(EVENT_MOUSE_MOVE, (this._dragmove = proxy(this.dragmove, this))).on(EVENT_MOUSE_UP, (this._dragend = proxy(this.dragend, this)));

    if (options.responsive) {

      $window.on(EVENT_RESIZE, (this._resize = proxy(this.resize, this)));

    }

  };

  prototype.removeListeners = function () {

    var options = this.options;

    this.$element.off(EVENT_DRAG_START, options.dragstart).off(EVENT_DRAG_MOVE, options.dragmove).off(EVENT_DRAG_END, options.dragend).off(EVENT_ZOOM_IN, options.zoomin).off(EVENT_ZOOM_OUT, options.zoomout);

    this.$cropper.off(EVENT_MOUSE_DOWN, this.dragstart).off(EVENT_DBLCLICK, this.dblclick);

    if (options.zoomable && options.mouseWheelZoom) {

      this.$cropper.off(EVENT_WHEEL, this.wheel);

    }

    $document.off(EVENT_MOUSE_MOVE, this._dragmove).off(EVENT_MOUSE_UP, this._dragend);

    if (options.responsive) {

      $window.off(EVENT_RESIZE, this._resize);

    }

  };

  $.extend(prototype, {

    resize: function () {

      var $container = this.$container,

          container = this.container,

          canvasData,

          cropBoxData,

          ratio;

      if (this.disabled) {

        return;

      }

      ratio = $container.width() / container.width;

      if (ratio !== 1 || $container.height() !== container.height) {

        canvasData = this.getCanvasData();

        cropBoxData = this.getCropBoxData();

        this.render();

        this.setCanvasData($.each(canvasData, function (i, n) {

          canvasData[i] = n * ratio;

        }));

        this.setCropBoxData($.each(cropBoxData, function (i, n) {

          cropBoxData[i] = n * ratio;

        }));

      }

    },

    dblclick: function () {

      if (this.disabled) {

        return;

      }

      if (this.$dragBox.hasClass(CLASS_CROP)) {

        this.setDragMode('move');

      } else {

        this.setDragMode('crop');

      }

    },

    wheel: function (event) {

      var e = event.originalEvent,

          delta = 1;

      if (this.disabled) {

        return;

      }

      event.preventDefault();

      if (e.deltaY) {

        delta = e.deltaY > 0 ? 1 : -1;

      } else if (e.wheelDelta) {

        delta = -e.wheelDelta / 120;

      } else if (e.detail) {

        delta = e.detail > 0 ? 1 : -1;

      }

      this.zoom(-delta * 0.1);

    },

    dragstart: function (event) {

      var options = this.options,

          originalEvent = event.originalEvent,

          touches = originalEvent && originalEvent.touches,

          e = event,

          dragType,

          dragStartEvent,

          touchesLength;

      if (this.disabled) {

        return;

      }

      if (touches) {

        touchesLength = touches.length;

        if (touchesLength > 1) {

          if (options.zoomable && options.touchDragZoom && touchesLength === 2) {

            e = touches[1];

            this.startX2 = e.pageX;

            this.startY2 = e.pageY;

            dragType = 'zoom';

          } else {

            return;

          }

        }

        e = touches[0];

      }

      dragType = dragType || $(e.target).data('drag');

      if (REGEXP_DRAG_TYPES.test(dragType)) {

        event.preventDefault();

        dragStartEvent = $.Event(EVENT_DRAG_START, {

          originalEvent: originalEvent,

          dragType: dragType

        });

        this.$element.trigger(dragStartEvent);

        if (dragStartEvent.isDefaultPrevented()) {

          return;

        }

        this.dragType = dragType;

        this.cropping = false;

        this.startX = e.pageX;

        this.startY = e.pageY;

        if (dragType === 'crop') {

          this.cropping = true;

          this.$dragBox.addClass(CLASS_MODAL);

        }

      }

    },

    dragmove: function (event) {

      var options = this.options,

          originalEvent = event.originalEvent,

          touches = originalEvent && originalEvent.touches,

          e = event,

          dragType = this.dragType,

          dragMoveEvent,

          touchesLength;

      if (this.disabled) {

        return;

      }

      if (touches) {

        touchesLength = touches.length;

        if (touchesLength > 1) {

          if (options.zoomable && options.touchDragZoom && touchesLength === 2) {

            e = touches[1];

            this.endX2 = e.pageX;

            this.endY2 = e.pageY;

          } else {

            return;

          }

        }

        e = touches[0];

      }

      if (dragType) {

        event.preventDefault();

        dragMoveEvent = $.Event(EVENT_DRAG_MOVE, {

          originalEvent: originalEvent,

          dragType: dragType

        });

        this.$element.trigger(dragMoveEvent);

        if (dragMoveEvent.isDefaultPrevented()) {

          return;

        }

        this.endX = e.pageX;

        this.endY = e.pageY;

        this.change();

      }

    },

    dragend: function (event) {

      var dragType = this.dragType,

          dragEndEvent;

      if (this.disabled) {

        return;

      }

      if (dragType) {

        event.preventDefault();

        dragEndEvent = $.Event(EVENT_DRAG_END, {

          originalEvent: event.originalEvent,

          dragType: dragType

        });

        this.$element.trigger(dragEndEvent);

        if (dragEndEvent.isDefaultPrevented()) {

          return;

        }

        if (this.cropping) {

          this.cropping = false;

          this.$dragBox.toggleClass(CLASS_MODAL, this.cropped && this.options.modal);

        }

        this.dragType = '';

      }

    }

  });

  $.extend(prototype, {

    reset: function () {

      if (!this.built || this.disabled) {

        return;

      }

      this.image = $.extend({}, this.initialImage);

      this.canvas = $.extend({}, this.initialCanvas);

      this.renderCanvas();

      if (this.cropped) {

        this.cropBox = $.extend({}, this.initialCropBox);

        this.renderCropBox();

      }

    },

    clear: function () {

      if (!this.cropped || this.disabled) {

        return;

      }

      $.extend(this.cropBox, {

        left: 0,

        top: 0,

        width: 0,

        height: 0

      });

      this.cropped = false;

      this.renderCropBox();

      this.limitCanvas();

      this.renderCanvas(); // Render canvas after render crop box

      this.$dragBox.removeClass(CLASS_MODAL);

      this.$cropBox.addClass(CLASS_HIDDEN);

    },

    destroy: function () {

      var $this = this.$element;

      if (this.ready) {

        this.unbuild();

        $this.removeClass(CLASS_HIDDEN);

      } else {

        this.$clone.off('load').remove();

      }

      $this.removeData('cropper');

    },

    replace: function (url) {

      if (!this.disabled && url) {

        this.load(url);

      }

    },

    enable: function () {

      if (this.built) {

        this.disabled = false;

        this.$cropper.removeClass(CLASS_DISABLED);

      }

    },

    disable: function () {

      if (this.built) {

        this.disabled = true;

        this.$cropper.addClass(CLASS_DISABLED);

      }

    },

    move: function (offsetX, offsetY) {

      var canvas = this.canvas;

      if (this.built && !this.disabled && isNumber(offsetX) && isNumber(offsetY)) {

        canvas.left += offsetX;

        canvas.top += offsetY;

        this.renderCanvas(true);

      }

    },

    zoom: function (delta) {

      var canvas = this.canvas,

          zoomEvent,

          width,

          height;

      delta = num(delta);

      if (delta && this.built && !this.disabled && this.options.zoomable) {

        zoomEvent = delta > 0 ? $.Event(EVENT_ZOOM_IN) : $.Event(EVENT_ZOOM_OUT);

        this.$element.trigger(zoomEvent);

        if (zoomEvent.isDefaultPrevented()) {

          return;

        }

        delta = delta <= -1 ? 1 / (1 - delta) : delta <= 1 ? (1 + delta) : delta;

        width = canvas.width * delta;

        height = canvas.height * delta;

        canvas.left -= (width - canvas.width) / 2;

        canvas.top -= (height - canvas.height) / 2;

        canvas.width = width;

        canvas.height = height;

        this.renderCanvas(true);

        this.setDragMode('move');

      }

    },

    rotate: function (degree) {

      var image = this.image;

      degree = num(degree);

      if (degree && this.built && !this.disabled && this.options.rotatable) {

        image.rotate = (image.rotate + degree) % 360;

        this.rotated = true;

        this.renderCanvas(true);

      }

    },

    getData: function () {

      var cropBox = this.cropBox,

          canvas = this.canvas,

          image = this.image,

          ratio,

          data;

      if (this.built && this.cropped) {

        data = {

          x: cropBox.left - canvas.left,

          y: cropBox.top - canvas.top,

          width: cropBox.width,

          height: cropBox.height

        };

        ratio = image.width / image.naturalWidth;

        $.each(data, function (i, n) {

          n = n / ratio;

          data[i] = n;

        });

      } else {

        data = {

          x: 0,

          y: 0,

          width: 0,

          height: 0

        };

      }

      data.rotate = image.rotate;

      return data;

    },

    getContainerData: function () {

      return this.built ? this.container : {};

    },

    getImageData: function () {

      return this.ready ? this.image : {};

    },

    getCanvasData: function () {

      var canvas = this.canvas,

          data;

      if (this.built) {

        data = {

          left: canvas.left,

          top: canvas.top,

          width: canvas.width,

          height: canvas.height

        };

      }

      return data || {};

    },

    setCanvasData: function (data) {

      var canvas = this.canvas,

          aspectRatio = canvas.aspectRatio;

      if (this.built && !this.disabled && $.isPlainObject(data)) {

        if (isNumber(data.left)) {

          canvas.left = data.left;

        }

        if (isNumber(data.top)) {

          canvas.top = data.top;

        }

        if (isNumber(data.width)) {

          canvas.width = data.width;

          canvas.height = data.width / aspectRatio;

        } else if (isNumber(data.height)) {

          canvas.height = data.height;

          canvas.width = data.height * aspectRatio;

        }

        this.renderCanvas(true);

      }

    },

    getCropBoxData: function () {

      var cropBox = this.cropBox,

          data;

      if (this.built && this.cropped) {

        data = {

          left: cropBox.left,

          top: cropBox.top,

          width: cropBox.width,

          height: cropBox.height

        };

      }

      return data || {};

    },

    setCropBoxData: function (data) {

      var cropBox = this.cropBox,

          aspectRatio = this.options.aspectRatio;

      if (this.built && this.cropped && !this.disabled && $.isPlainObject(data)) {

        if (isNumber(data.left)) {

          cropBox.left = data.left;

        }

        if (isNumber(data.top)) {

          cropBox.top = data.top;

        }

        if (aspectRatio) {

          if (isNumber(data.width)) {

            cropBox.width = data.width;

            cropBox.height = cropBox.width / aspectRatio;

          } else if (isNumber(data.height)) {

            cropBox.height = data.height;

            cropBox.width = cropBox.height * aspectRatio;

          }

        } else {

          if (isNumber(data.width)) {

            cropBox.width = data.width;

          }

          if (isNumber(data.height)) {

            cropBox.height = data.height;

          }

        }

        this.renderCropBox();

      }

    },

    getCroppedCanvas: function (options) {  //获取画布

      var originalWidth,

          originalHeight,

          canvasWidth,

          canvasHeight,

          scaledWidth,

          scaledHeight,

          scaledRatio,

          aspectRatio,

          canvas,

          context,

          data;

      if (!this.built || !this.cropped || !SUPPORT_CANVAS) {

        return;

      }

      if (!$.isPlainObject(options)) {

        options = {};

      }

      data = this.getData();

      originalWidth = data.width;

      originalHeight = data.height;

      aspectRatio = originalWidth / originalHeight;

      if ($.isPlainObject(options)) {

        scaledWidth = options.width;

        scaledHeight = options.height;

        if (scaledWidth) {

          scaledHeight = scaledWidth / aspectRatio;

          scaledRatio = scaledWidth / originalWidth;

        } else if (scaledHeight) {

          scaledWidth = scaledHeight * aspectRatio;

          scaledRatio = scaledHeight / originalHeight;

        }

      }

      canvasWidth = scaledWidth || originalWidth;

      canvasHeight = scaledHeight || originalHeight;

      canvas = $('<canvas>')[0];

      canvas.width = canvasWidth;

      canvas.height = canvasHeight;

      context = canvas.getContext('2d');

      if (options.fillColor) {

        context.fillStyle = options.fillColor;

        context.fillRect(0, 0, canvasWidth, canvasHeight);

      }

      // https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D.drawImage

      context.drawImage.apply(context, (function () {

        var source = getSourceCanvas(this.$clone[0], this.image),

            sourceWidth = source.width,

            sourceHeight = source.height,

            args = [source],

            srcX = data.x, // source canvas

            srcY = data.y,

            srcWidth,

            srcHeight,

            dstX, // destination canvas

            dstY,

            dstWidth,

            dstHeight;

        if (srcX <= -originalWidth || srcX > sourceWidth) {

          srcX = srcWidth = dstX = dstWidth = 0;

        } else if (srcX <= 0) {

          dstX = -srcX;

          srcX = 0;

          srcWidth = dstWidth = min(sourceWidth, originalWidth + srcX);

        } else if (srcX <= sourceWidth) {

          dstX = 0;

          srcWidth = dstWidth = min(originalWidth, sourceWidth - srcX);

        }

        if (srcWidth <= 0 || srcY <= -originalHeight || srcY > sourceHeight) {

          srcY = srcHeight = dstY = dstHeight = 0;

        } else if (srcY <= 0) {

          dstY = -srcY;

          srcY = 0;

          srcHeight = dstHeight = min(sourceHeight, originalHeight + srcY);

        } else if (srcY <= sourceHeight) {

          dstY = 0;

          srcHeight = dstHeight = min(originalHeight, sourceHeight - srcY);

        }

        args.push(srcX, srcY, srcWidth, srcHeight);

        // Scale destination sizes

        if (scaledRatio) {

          dstX *= scaledRatio;

          dstY *= scaledRatio;

          dstWidth *= scaledRatio;

          dstHeight *= scaledRatio;

        }

        // Avoid "IndexSizeError" in IE and Firefox

        if (dstWidth > 0 && dstHeight > 0) {

          args.push(dstX, dstY, dstWidth, dstHeight);

        }

        return args;

      }).call(this));

      return canvas;

    },

    setAspectRatio: function (aspectRatio) {

      var options = this.options;

      if (!this.disabled && !isUndefined(aspectRatio)) {

        options.aspectRatio = num(aspectRatio) || NaN; // 0 -> NaN

        if (this.built) {

          this.initCropBox();

          if (this.cropped) {

            this.renderCropBox();

          }

        }

      }

    },

    setDragMode: function (mode) {

      var $dragBox = this.$dragBox,

          cropable = false,

          movable = false;

      if (!this.ready || this.disabled) {

        return;

      }

      switch (mode) {

        case 'crop':

          if (this.options.dragCrop) {

            cropable = true;

            $dragBox.data('drag', mode);

          } else {

            movable = true;

          }

          break;

        case 'move':

          movable = true;

          $dragBox.data('drag', mode);

          break;

        default:

          $dragBox.removeData('drag');

      }

      $dragBox.toggleClass(CLASS_CROP, cropable).toggleClass(CLASS_MOVE, movable);

    }

  });

  prototype.change = function () {

    var dragType = this.dragType,

        options = this.options,

        canvas = this.canvas,

        container = this.container,

        cropBox = this.cropBox,

        width = cropBox.width,

        height = cropBox.height,

        left = cropBox.left,

        top = cropBox.top,

        right = left + width,

        bottom = top + height,

        minLeft = 0,

        minTop = 0,

        maxWidth = container.width,

        maxHeight = container.height,

        renderable = true,

        aspectRatio = options.aspectRatio,

        range = {

          x: this.endX - this.startX,

          y: this.endY - this.startY

        },

        offset;

    if (options.strict) {

      minLeft = cropBox.minLeft;

      minTop = cropBox.minTop;

      maxWidth = minLeft + min(container.width, canvas.width);

      maxHeight = minTop + min(container.height, canvas.height);

    }

    if (aspectRatio) {

      range.X = range.y * aspectRatio;

      range.Y = range.x / aspectRatio;

    }

    switch (dragType) {

      // Move cropBox

      case 'all':

        left += range.x;

        top += range.y;

        break;

      // Resize cropBox

      case 'e':

        if (range.x >= 0 && (right >= maxWidth || aspectRatio && (top <= minTop || bottom >= maxHeight))) {

          renderable = false;

          break;

        }

        width += range.x;

        if (aspectRatio) {

          height = width / aspectRatio;

          top -= range.Y / 2;

        }

        if (width < 0) {

          dragType = 'w';

          width = 0;

        }

        break;

      case 'n':

        if (range.y <= 0 && (top <= minTop || aspectRatio && (left <= minLeft || right >= maxWidth))) {

          renderable = false;

          break;

        }

        height -= range.y;

        top += range.y;

        if (aspectRatio) {

          width = height * aspectRatio;

          left += range.X / 2;

        }

        if (height < 0) {

          dragType = 's';

          height = 0;

        }

        break;

      case 'w':

        if (range.x <= 0 && (left <= minLeft || aspectRatio && (top <= minTop || bottom >= maxHeight))) {

          renderable = false;

          break;

        }

        width -= range.x;

        left += range.x;

        if (aspectRatio) {

          height = width / aspectRatio;

          top += range.Y / 2;

        }

        if (width < 0) {

          dragType = 'e';

          width = 0;

        }

        break;

      case 's':

        if (range.y >= 0 && (bottom >= maxHeight || aspectRatio && (left <= minLeft || right >= maxWidth))) {

          renderable = false;

          break;

        }

        height += range.y;

        if (aspectRatio) {

          width = height * aspectRatio;

          left -= range.X / 2;

        }

        if (height < 0) {

          dragType = 'n';

          height = 0;

        }

        break;

      case 'ne':

        if (aspectRatio) {

          if (range.y <= 0 && (top <= minTop || right >= maxWidth)) {

            renderable = false;

            break;

          }

          height -= range.y;

          top += range.y;

          width = height * aspectRatio;

        } else {

          if (range.x >= 0) {

            if (right < maxWidth) {

              width += range.x;

            } else if (range.y <= 0 && top <= minTop) {

              renderable = false;

            }

          } else {

            width += range.x;

          }

          if (range.y <= 0) {

            if (top > 0) {

              height -= range.y;

              top += range.y;

            }

          } else {

            height -= range.y;

            top += range.y;

          }

        }

        if (width < 0 && height < 0) {

          dragType = 'sw';

          height = 0;

          width = 0;

        } else if (width < 0) {

          dragType = 'nw';

          width = 0;

        } else if (height < 0) {

          dragType = 'se';

          height = 0;

        }

        break;

      case 'nw':

        if (aspectRatio) {

          if (range.y <= 0 && (top <= minTop || left <= minLeft)) {

            renderable = false;

            break;

          }

          height -= range.y;

          top += range.y;

          width = height * aspectRatio;

          left += range.X;

        } else {

          if (range.x <= 0) {

            if (left > 0) {

              width -= range.x;

              left += range.x;

            } else if (range.y <= 0 && top <= minTop) {

              renderable = false;

            }

          } else {

            width -= range.x;

            left += range.x;

          }

          if (range.y <= 0) {

            if (top > 0) {

              height -= range.y;

              top += range.y;

            }

          } else {

            height -= range.y;

            top += range.y;

          }

        }

        if (width < 0 && height < 0) {

          dragType = 'se';

          height = 0;

          width = 0;

        } else if (width < 0) {

          dragType = 'ne';

          width = 0;

        } else if (height < 0) {

          dragType = 'sw';

          height = 0;

        }

        break;

      case 'sw':

        if (aspectRatio) {

          if (range.x <= 0 && (left <= minLeft || bottom >= maxHeight)) {

            renderable = false;

            break;

          }

          width -= range.x;

          left += range.x;

          height = width / aspectRatio;

        } else {

          if (range.x <= 0) {

            if (left > 0) {

              width -= range.x;

              left += range.x;

            } else if (range.y >= 0 && bottom >= maxHeight) {

              renderable = false;

            }

          } else {

            width -= range.x;

            left += range.x;

          }

          if (range.y >= 0) {

            if (bottom < maxHeight) {

              height += range.y;

            }

          } else {

            height += range.y;

          }

        }

        if (width < 0 && height < 0) {

          dragType = 'ne';

          height = 0;

          width = 0;

        } else if (width < 0) {

          dragType = 'se';

          width = 0;

        } else if (height < 0) {

          dragType = 'nw';

          height = 0;

        }

        break;

      case 'se':

        if (aspectRatio) {

          if (range.x >= 0 && (right >= maxWidth || bottom >= maxHeight)) {

            renderable = false;

            break;

          }

          width += range.x;

          height = width / aspectRatio;

        } else {

          if (range.x >= 0) {

            if (right < maxWidth) {

              width += range.x;

            } else if (range.y >= 0 && bottom >= maxHeight) {

              renderable = false;

            }

          } else {

            width += range.x;

          }

          if (range.y >= 0) {

            if (bottom < maxHeight) {

              height += range.y;

            }

          } else {

            height += range.y;

          }

        }

        if (width < 0 && height < 0) {

          dragType = 'nw';

          height = 0;

          width = 0;

        } else if (width < 0) {

          dragType = 'sw';

          width = 0;

        } else if (height < 0) {

          dragType = 'ne';

          height = 0;

        }

        break;

      // Move image

      case 'move':

        canvas.left += range.x;

        canvas.top += range.y;

        this.renderCanvas(true);

        renderable = false;

        break;

      // Scale image

      case 'zoom':

        this.zoom(function (x1, y1, x2, y2) {

          var z1 = sqrt(x1 * x1 + y1 * y1),

              z2 = sqrt(x2 * x2 + y2 * y2);

          return (z2 - z1) / z1;

        }(

          abs(this.startX - this.startX2),

          abs(this.startY - this.startY2),

          abs(this.endX - this.endX2),

          abs(this.endY - this.endY2)

        ));

        this.startX2 = this.endX2;

        this.startY2 = this.endY2;

        renderable = false;

        break;

      // Crop image

      case 'crop':

        if (range.x && range.y) {

          offset = this.$cropper.offset();

          left = this.startX - offset.left;

          top = this.startY - offset.top;

          width = cropBox.minWidth;

          height = cropBox.minHeight;

          if (range.x > 0) {

            if (range.y > 0) {

              dragType = 'se';

            } else {

              dragType = 'ne';

              top -= height;

            }

          } else {

            if (range.y > 0) {

              dragType = 'sw';

              left -= width;

            } else {

              dragType = 'nw';

              left -= width;

              top -= height;

            }

          }

          // Show the cropBox if is hidden

          if (!this.cropped) {

            this.cropped = true;

            this.$cropBox.removeClass(CLASS_HIDDEN);

          }

        }

        break;

      // No default

    }

    if (renderable) {

      cropBox.width = width;

      cropBox.height = height;

      cropBox.left = left;

      cropBox.top = top;

      this.dragType = dragType;

      this.renderCropBox();

    }

    // Override

    this.startX = this.endX;

    this.startY = this.endY;

  };

  $.extend(Cropper.prototype, prototype);

  Cropper.DEFAULTS = {

    // Defines the aspect ratio of the crop box

    // Type: Number

    aspectRatio: NaN,

    // Defines the percentage of automatic cropping area when initializes

    // Type: Number (Must large than 0 and less than 1)

    autoCropArea: 0.8, // 80%

    // Outputs the cropping results.

    // Type: Function

    crop: null,

    // Add extra containers for previewing

    // Type: String (jQuery selector)

    preview: '',

    // Toggles

    strict: true, // strict mode, the image cannot zoom out less than the container

    responsive: true, // Rebuild when resize the window

    checkImageOrigin: true, // Check if the target image is cross origin

    modal: true, // Show the black modal

    guides: true, // Show the dashed lines for guiding

    highlight: true, // Show the white modal to highlight the crop box

    background: true, // Show the grid background

    autoCrop: true, // Enable to crop the image automatically when initialize

    dragCrop: true, // Enable to create new crop box by dragging over the image

    movable: true, // Enable to move the crop box

    resizable: true, // Enable to resize the crop box

    rotatable: true, // Enable to rotate the image

    zoomable: true, // Enable to zoom the image

    touchDragZoom: true, // Enable to zoom the image by wheeling mouse

    mouseWheelZoom: true, // Enable to zoom the image by dragging touch

    // Dimensions

    minCanvasWidth: 0,

    minCanvasHeight: 0,

    minCropBoxWidth: 0,

    minCropBoxHeight: 0,

    minContainerWidth: 200,

    minContainerHeight: 100,

    // Events

    build: null, // Function

    built: null, // Function

    dragstart: null, // Function

    dragmove: null, // Function

    dragend: null, // Function

    zoomin: null, // Function

    zoomout: null // Function

  };

  Cropper.setDefaults = function (options) {

    $.extend(Cropper.DEFAULTS, options);

  };

  // Use the string compressor: Strmin (https://github.com/fengyuanchen/strmin)

  Cropper.TEMPLATE = (function (source, words) {

    words = words.split(',');

    return source.replace(/\d+/g, function (i) {

      return words[i];

    });

  })('<0 6="5-container"><0 6="5-canvas"></0><0 6="5-2-9" 3-2="move"></0><0 6="5-crop-9"><1 6="5-view-9"></1><1 6="5-8 8-h"></1><1 6="5-8 8-v"></1><1 6="5-face" 3-2="all"></1><1 6="5-7 7-e" 3-2="e"></1><1 6="5-7 7-n" 3-2="n"></1><1 6="5-7 7-w" 3-2="w"></1><1 6="5-7 7-s" 3-2="s"></1><1 6="5-4 4-e" 3-2="e"></1><1 6="5-4 4-n" 3-2="n"></1><1 6="5-4 4-w" 3-2="w"></1><1 6="5-4 4-s" 3-2="s"></1><1 6="5-4 4-ne" 3-2="ne"></1><1 6="5-4 4-nw" 3-2="nw"></1><1 6="5-4 4-sw" 3-2="sw"></1><1 6="5-4 4-se" 3-2="se"></1></0></0>', 'div,span,drag,data,point,cropper,class,line,dashed,box');

  /* Template source:

  <div class="cropper-container">

    <div class="cropper-canvas"></div>

    <div class="cropper-drag-box" data-drag="move"></div>

    <div class="cropper-crop-box">

      <span class="cropper-view-box"></span>

      <span class="cropper-dashed dashed-h"></span>

      <span class="cropper-dashed dashed-v"></span>

      <span class="cropper-face" data-drag="all"></span>

      <span class="cropper-line line-e" data-drag="e"></span>

      <span class="cropper-line line-n" data-drag="n"></span>

      <span class="cropper-line line-w" data-drag="w"></span>

      <span class="cropper-line line-s" data-drag="s"></span>

      <span class="cropper-point point-e" data-drag="e"></span>

      <span class="cropper-point point-n" data-drag="n"></span>

      <span class="cropper-point point-w" data-drag="w"></span>

      <span class="cropper-point point-s" data-drag="s"></span>

      <span class="cropper-point point-ne" data-drag="ne"></span>

      <span class="cropper-point point-nw" data-drag="nw"></span>

      <span class="cropper-point point-sw" data-drag="sw"></span>

      <span class="cropper-point point-se" data-drag="se"></span>

    </div>

  </div>

  */

  // Save the other cropper

  Cropper.other = $.fn.cropper;

  // Register as jQuery plugin

  $.fn.cropper = function (options) {

    var args = toArray(arguments, 1),

        result;

    this.each(function () {

      var $this = $(this),

          data = $this.data('cropper'),

          fn;

      if (!data) {

        $this.data('cropper', (data = new Cropper(this, options)));

      }

      if (typeof options === 'string' && $.isFunction((fn = data[options]))) {

        result = fn.apply(data, args);

      }

    });

    return isUndefined(result) ? this : result;

  };

  $.fn.cropper.Constructor = Cropper;

  $.fn.cropper.setDefaults = Cropper.setDefaults;

  // No conflict

  $.fn.cropper.noConflict = function () {

    $.fn.cropper = Cropper.other;

    return this;

  };

	function compress(img) {  //图片压缩的方法

        var initSize = img.src.length;

        var width = img.width;

        var height = img.height;

        //如果图片大于四百万像素，计算压缩比并将大小压至400万以下

        var ratio;

        if ((ratio = width * height / 4000000)>1) {

            ratio = Math.sqrt(ratio);

            width /= ratio;

            height /= ratio;

        }else {

            ratio = 1;

        }

        canvas.width = width;

        canvas.height = height;

//        铺底色

        ctx.fillStyle = "#fff";

        ctx.fillRect(0, 0, canvas.width, canvas.height);

        //如果图片像素大于100万则使用瓦片绘制

        var count;

        if ((count = width * height / 1000000) > 1) {

            count = ~~(Math.sqrt(count)+1); //计算要分成多少块瓦片

//            计算每块瓦片的宽和高

            var nw = ~~(width / count);

            var nh = ~~(height / count);

            tCanvas.width = nw;

            tCanvas.height = nh;

            for (var i = 0; i < count; i++) {

                for (var j = 0; j < count; j++) {

                    tctx.drawImage(img, i * nw * ratio, j * nh * ratio, nw * ratio, nh * ratio, 0, 0, nw, nh);

                    ctx.drawImage(tCanvas, i * nw, j * nh, nw, nh);

                }

            }

        } else {

            ctx.drawImage(img, 0, 0, width, height);

        }

        //进行最小压缩

        var ndata = canvas.toDataURL('image/jpeg', 0.1);

        console.log('压缩前：' + initSize);

        console.log('压缩后：' + ndata.length);

        console.log('压缩率：' + ~~(100 * (initSize - ndata.length) / initSize) + "%");

        tCanvas.width = tCanvas.height = canvas.width = canvas.height = 0;

        return ndata;

    }	

});

这里的copper.js插件原来用的是  toDataUrl()方法  由于前面提到的问题我将它改成了compress方法

在做这个项目时我发现微信和QQ浏览器base64位数据前面要截取的文档头长度不一致

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