CSS深入理解学习笔记之absolute

2022-06-07 02:00:20

1、absolute和float

　　拥有相同的特性表现：

　　　　①包裹性（容器应用之后，可以包裹里面的内容）；

 <!doctype html>

 <html>

 <head>

 <meta charset="utf-8">

 <meta name="viewport" content="width=device-width">

 <title>absolute的包裹性</title>

 <style>

 .box {

     padding: 10px;

     background-color: #f0f0f0;

 }

 input {

     position: absolute; top: 234px;

     width: 160px; height: 32px;

     font-size: 100%;

 }

 </style>

 </head>

 <body>

 <div id="box" class="box"><img src="http://img.mukewang.com/54447b06000171a002560191.jpg" width="256" height="191"></div>

 <input id="button" type="button" value="容器absolute化">

 <script>

 var eleBox = document.getElementById("box"), eleBtn = document.getElementById("button");

 if (eleBox != null && eleBtn != null) {

     eleBtn.onclick = function() {

         if (this.absolute) {

             eleBox.style.position = "";

             this.value = "容器absolute化";

             this.absolute = false;

         } else {

             eleBox.style.position = "absolute";

             this.value = "容器去absolute";

             this.absolute = true;

         }

     };

 }

 </script>

 </body>

 </html>

　　　　②破坏性（内容应用之后，会破坏父容器）

 <!doctype html>

 <html>

 <head>

 <meta charset="utf-8">

 <meta name="viewport" content="width=device-width">

 <title>absolute的破坏性</title>

 <style>

 .box {

     padding: 10px;

     background-color: #f0f0f0;

 }

 input {

     position: absolute; top: 234px;

     width: 160px; height: 32px;

     font-size: 100%;

 }

 </style>

 </head>

 <body>

 <div class="box"><img id="image" src="http://img.mukewang.com/54447b06000171a002560191.jpg" width="256" height="191"></div>

 <input id="button" type="button" value="图片absolute化">

 <script>

 var eleImg = document.getElementById("image"), eleBtn = document.getElementById("button");

 if (eleImg != null && eleBtn != null) {

     eleBtn.onclick = function() {

         if (this.absolute) {

             eleImg.style.position = "";

             this.value = "图片absolute化";

             this.absolute = false;

         } else {

             eleImg.style.position = "absolute";

             this.value = "图片去absolute";

             this.absolute = true;

         }

     };

 }

 </script>

 </body>

 </html>

2、absolute和relative

　　absolute和relative是分离的，对立的。父容器是relative，子元素是absolute，可以限制子元素对父元素破坏性的影响。

　　独立的absolute可以摆脱overflow的限制，无论是滚动还是隐藏。

<div style = "overflow:scroll;">

    <a href="javascript:void(0);" title="close" style="position:absolute;"></a>

    <img src="img1.jpg" />

    <img src="img2.jpg" />

</div>

3、无依赖的absolute定位

　　无依赖是指不受父元素relative限制的absolute定位，行为表现上是不使用top/right/bottom/left任何一个属性或使用auto作为值。

　　特性：①脱离文档流；

　　　　　②位置跟随；

　　　　　③去浮动（效果同上图）；

　　　　　④IE7下会inline-block化（解决方案：在元素外层套一个空div标签）

4、absolute的实际应用

　　（1）图片图标绝对定位覆盖：

　　　　先来点小技巧，在实际开发中，为了好看标签一般都各占一行。为了消除不必要的空格，可以如下处理：

　　　　效果图：

　　　　实例代码：

 <!doctype html>

 <html>

 <head>

 <meta charset="utf-8">

 <title>图标定位二三事</title>

 <style>

 body { font: 14px/1.4 "Microsoft YaHei"; background-color: #EDEFF0; }

 body, h3, h5 { margin: 0; }

 img { border: 0 none; vertical-align: bottom; }

 .l { float: left; }.r { float: right; }

 .constr { width: 1200px; margin-left: auto; margin-right: auto; }

 .header { background-color: #2A2C2E; }

 .nav { height: 60px; }

 .nav-list { float: left; font-size: 14px; font-weight: 400; }

 .nav-a { display: inline-block; line-height: 20px; padding: 20px 35px; color: #B5BDC0; text-decoration: none; }

 .nav-a:hover { color: #fff; }

 .course { padding-top: 10px; }

 .course-list { float: left; width: 280px; height: 240px; margin: 5px 10px 15px; border-radius: 0 0 1px 1px; background-color: #F7FAF9; background-color: rgba(255,255,255,1); box-shadow: 0 1px 2px #c5c5c5; text-decoration: none; }

 .course-list-img { background-color: #6396F1; }

 .course-list-h { line-height: 50px; font-size: 14px; font-weight: 400; color: #363d40; text-align: center; }

 .course-list-tips { margin: 0 14px; font-size: 12px; color: #b4bbbf; overflow: hidden; }

 .icon-hot { position: absolute; width: 28px; height: 11px; margin: -6px 0 0 2px; background: url(http://img.mukewang.com/545304730001307300280011.gif); }

 .icon-recom { position: absolute; line-height: 20px; padding: 0 5px; background-color: #f60; color: #fff; font-size: 12px; }

 .icon-vip { position: absolute; width: 36px; height: 36px; margin-left: -36px; background: url(http://img.mukewang.com/5453048000015d8800360036.gif); text-indent: -9em; overflow: hidden; }

 </style>

 </head>

 <body>

 <div class="header">

     <div class="constr">

         <div class="nav">

             <h3 class="nav-list">

                 <a href="http://www.imooc.com/course/list" class="nav-a">课程</a>

             </h3>

             <h3 class="nav-list">

                 <a href="http://www.imooc.com/wenda" class="nav-a">问答</a>

             </h3>

             <h3 class="nav-list">

                 <a href="http://www.imooc.com/seek/index" class="nav-a">

                     求课<i class="icon-hot"></i>

                 </a>

             </h3>

         </div>

     </div>

 </div>

 <div class="main">

     <div class="constr">

         <div class="course">

             <a href="http://www.imooc.com/view/121" class="course-list">

                 <div class="course-list-img">

                     <span class="icon-recom">推荐</span>

                     <img width="280" height="160" alt="分享：CSS深入理解之float浮动" src="http://img.mukewang.com/53d74f960001ae9d06000338-300-170.jpg"><!--

                     --><i class="icon-vip">vip</i>

                 </div>

                 <h5 class="course-list-h">分享：CSS深入理解之float浮动</h5>

                 <div class="course-list-tips">

                     <span class="l">已完结</span>

                     <span class="r">3514人学习</span>

                 </div>

             </a>

         </div>

     </div>

 </div>

 </body>

 </html>

　　（2）下拉框定位最佳实践：

　　　　效果图：

　　　　实例代码：

 <!doctype html>

 <html>

 <head>

 <meta charset="utf-8">

 <title>下拉框定位二三事</title>

 <style>

 body { margin: 0; font: 14px/1.4 "Microsoft YaHei"; background-color: #EDEFF0; }

 .constr { width: 1200px; max-width: 80%; margin-left: auto; margin-right: auto; padding-bottom: 300px; overflow: hidden; }

 .course-sidebar { width: 262px; float: left; }

 .course-sidebar > div { border: 1px solid #e6e8e9; box-shadow: 0px 1px 2px #d5d7d8; background-color: #fff; }

 .course-sidebar-type { height: 380px; }

 .course-sidebar-search { margin-top: 20px; overflow: hidden; }

 .course-search-input { width: 200px; line-height: 18px; padding: 10px; margin: 0; border: 0 none; font-size: 12px; font-family: inherit; float: left; }

 .course-sidebar-search.focus { border-color: #2ea7e0; }

 .course-search-input:focus { outline: 0 none; }

 .course-search-input::-ms-clear { display: none; }

 .course-search-btn { width: 38px; height: 38px; float: right; background: url(http://img.mukewang.com/545305ba0001f3f600380076.png); text-indent: -9em; overflow: hidden; }

 .focus .course-search-btn { background-position: 0 -38px; }

 .course-sidebar-result { display: none; position: absolute; width: 260px; margin: 39px 0 0 -1px; padding-left: 0; list-style-type: none; border: 1px solid #e6e8e9; background-color: #fff; box-shadow: 0px 1px 2px #d5d7d8; font-size: 12px; }

 .course-sidebar-result > li { line-height: 30px; padding-left: 12px; }

 .course-sidebar-result > li:hover { background-color: #f9f9f9; }

 .course-sidebar-result a { display: block; color: #5e5e5e; text-decoration: none; }

 .course-sidebar-result a:hover { color: #000; }

 </style>

 </head>

 <body>

 <div class="constr">

     <div class="course-sidebar">

         <div class="course-sidebar-type"></div>

         <div class="course-sidebar-search">

             <ul id="result" class="course-sidebar-result">

                 <li><a href="http://www.imooc.com/view/121">分享：CSS深入理解之float浮动</a></li>

                 <li><a href="http://www.imooc.com/view/118">案例：CSS圆角进化论</a></li>

                 <li><a href="http://www.imooc.com/view/93">案例：CSS Sprite雪碧图应用</a></li>

                 <li><a href="http://www.imooc.com/view/77">案例：CSS3 3D 特效</a></li>

                 <li><a href="http://www.imooc.com/view/57">案例：如何用CSS进行网页布局</a></li>

             </ul>

             <input class="course-search-input" placeholder="课程搜索">

             <a href="javascript:" class="course-search-btn">搜索</a>

         </div>

     </div>

 </div>

 <script>

 (function() {

     var input = document.getElementsByTagName("input")[0],

         result = document.getElementById("result");

     if (input && result) {

         input.onfocus = function() {

             this.parentNode.className = "course-sidebar-search focus";

             if (this.value != "") {

                 // show datalist

                 result.style.display = "block";

             }

         };

         input.onblur = function() {

             if (this.value == "") {

                 this.parentNode.className = "course-sidebar-search";

             }

             // hide datalist

             result.style.display = "none";

         };

         // IE7 that wrap a DIV for avoid bad effect from float

         if (!document.querySelector) {

             var div = document.createElement("div");

             input.parentNode.insertBefore(div, input);

             div.appendChild(result);

         }

         // events of datalist

         if ("oninput" in input) {

             input.addEventListener("input", function() {

                 if (this.value.trim() != "") {

                     result.style.display = "block";

                 } else {

                     result.style.display = "none";

                 }

             });

         } else {

             // IE6-IE8

             input.onpropertychange = function(event) {

                 event = event || window.event;

                 if (event.propertyName == "value" && /focus/.test(this.parentNode.className)) {

                     if (this.value != "") {

                         result.style.display = "block";

                     } else {

                         result.style.display = "none";

                     }

                 }

             }

         }

     }

 })();

 </script>

 </body>

 </html>

　　（3）居中以及边缘对齐定位：

　　　　效果图：

　　　　实例代码：

 <!doctype html>

 <html>

 <head>

 <meta charset="utf-8">

 <title>居中、边缘定位二三事</title>

 <style>

 body { margin: 0; font: 14px/1.4 "Microsoft YaHei"; background-color: #EDEFF0; }

 .constr { width: 1200px; max-width: 80%; margin-left: auto; margin-right: auto; }

 .course-content { float: right; position: relative; width: 920px; min-height: 1200px; background: #fff; }

 .course-list-x { padding: 20px 10px; overflow: hidden; }

 .course-list { float: left; width: 280px; height: 240px; margin: 5px 10px 15px; border-radius: 0 0 1px 1px; background-color: #F7FAF9; background-color: rgba(255,255,255,1); box-shadow: 0 1px 2px #c5c5c5; text-decoration: none; }

 .goto_top_diaocha, .goto_top_app, .goto_top_feed { display: block; width: 48px; height: 48px; margin-top: 10px; background: url(http://img.mukewang.com/5453076e0001869c01920098.png) no-repeat; }

 .goto_top_diaocha { background-position: -48px 0; }

 .goto_top_diaocha:hover { background-position: -48px -50px; }

 .goto_top_app { background-position: -96px 0; }

 .goto_top_app:hover { background-position: -96px -50px; }

 .goto_top_feed { background-position: -144px 0; }

 .goto_top_feed:hover { background-position: -144px -50px; }

 .course-loading-x { height: 0; margin-top: 20px; text-align: center; letter-spacing: -.25em; overflow: hidden; }

 .course-loading { position: absolute; margin-left: -26px; }

 .course-fixed-x { height: 0; text-align: right; overflow: hidden; }

 .course-fixed { display: inline; position: fixed; margin-left: 20px; bottom: 100px; }

 </style>

 </head>

 <body>

 <div class="constr">

     <div class="course-content">

         <div class="course-list-x">

             <div class="course-list"></div>

             <div class="course-list"></div>

             <div class="course-list"></div>

             <div class="course-list"></div>

             <div class="course-list"></div>

             <div class="course-list"></div>

         </div>

         <div class="course-loading-x">

             &nbsp;<img src="http://img.mukewang.com/5453077400015bba00010001.gif" class="course-loading" alt="加载中...">

         </div>

         <div class="course-fixed-x">

             &nbsp;<div class="course-fixed">

                 <a href="http://www.imooc.com/activity/diaocha" class="goto_top_diaocha"></a>

                 <a href="http://www.imooc.com/mobile/app" class="goto_top_app"></a>

                 <a href="http://www.imooc.com/user/feedback" class="goto_top_feed"></a>

             </div>

         </div>

     </div>

 </div>

 </body>

 </html>

　　（4）各种对齐溢出技巧实例：

　　　　效果图：

　　　　实例代码：

 <!doctype html>

 <html>

 <head>

 <meta charset="utf-8">

 <title>文本图标对齐与定位二三事</title>

 <style>

 body { margin: 0; font: 14px/1.4 "Microsoft YaHei"; background-color: #EDEFF0; }

 a { color: #50B6E5; }

 .constr { width: 1200px; margin-left: auto; margin-right: auto; }

 .regist-head { height: 60px; line-height: 60px; padding-left: 30px; background-color: #be3948; color: #fff; font-size: 18px; }

 .regist-body { min-height: 400px; padding: 100px 0; background-color: #fff; }

 .regist-main { width: 600px; margin-left: auto; margin-right: auto; }

 .regist-group { margin-top: 20px; overflow: hidden; }

 .regist-label { width: 70px; padding-top: 10px; float: left; }

 .regist-cell { display: table-cell; *display: inline-block; }

 .regist-input { height: 18px; line-height: 18px; width: 260px; padding: 10px 5px; margin: 0 10px 0 0; border: 1px solid #d0d6d9; vertical-align: top; }

 .regist-code-input { width: 130px; }

 .regist-btn { display: inline-block; width: 160px; line-height: 40px; background-color: #39b94e; color: #fff; text-align: center; text-decoration: none; }

 .regist-btn:hover { background-color: #33a646; }

 .icon-warn { display: inline-block; width: 20px; height: 21px; background: url(http://img.mukewang.com/5453084a00016ae300120012.gif) no-repeat center; }

 .regist-star { position: absolute; margin-left: -1em; font-family: simsun; color: #f30; }

 .regist-remark { position: absolute; line-height: 21px; padding-top: 9px; color: #666; }

 .regist-warn { padding-left: 20px; color: #be3948; }

 .regist-warn > .icon-warn { position: absolute; margin-left: -20px; }

 </style>

 </head>

 <body>

 <div class="constr">

     <div class="regist-head">注册</div>

     <div class="regist-body">

         <div class="regist-main">

             <div class="regist-group">

                 <label class="regist-label"><span class="regist-star">*</span>登录邮箱</label>

                 <div class="regist-cell">

                     <input type="email" class="regist-input"><span class="regist-remark regist-warn">

                         <i class="icon-warn"></i>邮箱格式不准确（演示）

                     </span>

                 </div>

             </div>

             <div class="regist-group">

                 <label class="regist-label"><span class="regist-star">*</span>登录密码</label>

                 <div class="regist-cell">

                     <input type="password" class="regist-input"><span class="regist-remark">

                         请输入6-16位密码，区分大小写，不能使用空格

                     </span>

                 </div>

             </div>

             <div class="regist-group">

                 <label class="regist-label"><span class="regist-star">*</span>用户昵称</label>

                 <div class="regist-cell">

                     <input type="password" class="regist-input">

                 </div>

             </div>

             <div class="regist-group">

                 <label class="regist-label">手机号码</label>

                 <div class="regist-cell">

                     <input type="tel" class="regist-input">

                 </div>

             </div>

             <div class="regist-group">

                 <label class="regist-label"><span class="regist-star">*</span>验 证 码</label>

                 <div class="regist-cell">

                     <input class="regist-input regist-code-input"><img src="http://img.mukewang.com/545308540001678401500040.jpg">

                 </div>

             </div>

             <div class="regist-group">

                 <label class="regist-label">&nbsp;</label>

                 <div class="regist-cell">

                     <input type="checkbox" checked><label>我已阅读并同意<a href="##">慕课协议</a>。</label>

                     <p>

                         <a href="javascript:" class="regist-btn">立即注册</a>

                     </p>

                 </div>

             </div>

         </div>

     </div>

 </div>

 </body>

 </html>

5、absolute和层级

　　absolute具有脱离文档流的特性，因此有一些不成文的规定：

　　　　动画尽量作用在绝对定位元素上！

　　绝对定位元素的层级规律：

- 仅有一个绝对定位元素，则它会覆盖普通元素；
- 如果两个绝对定位元素，后来居上；
- 如果多个绝对定位元素，使用z-index：1控制；
- 若非弹窗类的绝对定位元素z-index>2是非常少见的，很有可能是冗余了，需要优化。

6、absolute和定位属性（top/right/bottom/left）

定位属性是相对于就近父级元素position为relative/absolute/fixed/sticky的元素进行定位的；
若只有一个定位属性，元素的位置会受到兄弟元素的影响。

7、top/right/bottom/left和width/height

　　相互替代性（例如：{position:absolute;width:100%;height:100%}=={position:absolute;top:0;right:0;bottom:0;left:0;})，这个特性只有IE7+浏览器支持；

　　相互支持性：

　　　　①容器无需固定width/height值，内部元素也可以拉伸；

　　　　②容器拉伸，内部元素支持百分比width/height值（注：元素百分比height想要起作用，父元素height不能是auto）；

 <!doctype html>

 <html>

 <head>

 <meta charset="utf-8">

 <title>高度自适应的九宫格效果</title>

 <style>

 html, body { height: 100%; margin: 0; }

 .page {

     position: absolute;

     left: 0; top: 0; right: 0; bottom: 0;

 }

 .list {

     float: left;

     height: 33.3%; width: 33.3%;

     position: relative;

 }

 .list:before {

     content: '';

     position: absolute;

     left: 10px; right: 10px; top: 10px; bottom: 10px;

     border-radius: 10px;

     background-color: #cad5eb;

 }

 .list:after {

     content:attr(data-index);

     position: absolute;

     height: 30px;

     left: 0; right: 0; top: 0; bottom: 0;

     margin: auto;

     text-align: center;

     font: 24px/30px bold 'microsoft yahei';

 }

 </style>

 </head>

 <body>

 <div class="page">

     <div class="list" data-index="1"></div>

     <div class="list" data-index="2"></div>

     <div class="list" data-index="3"></div>

     <div class="list" data-index="4"></div>

     <div class="list" data-index="5"></div>

     <div class="list" data-index="6"></div>

     <div class="list" data-index="7"></div>

     <div class="list" data-index="8"></div>

     <div class="list" data-index="9"></div>

 </div>

 </body>

 </html>

　　相互合作性：margin:auto的情况下，width/height影响尺寸，top/right/bottom/left影响位置。这个特性需要IE8+浏览器的支持。

<!doctype html>

<html>

<head>

<meta charset="utf-8">

<title>left/right拉伸和width同时存在</title>

<style>

.image {

    position: absolute; left: 0; right: 0; width: 50%;

}

.button {

    padding-top: 200px;

}

.button input {

    width: 280px; height: 40px;

    font-size: 20px;

}

</style>

</head>

<body>

<img class="image" src="http://img.mukewang.com/547c34c9000171a002560191.jpg" height="191">

<p class="button">

    <input type="button" value="添加margin: auto;" onClick="document.getElementsByTagName('img')[0].style.margin = 'auto';">

</p>

</body>

</html>

8、absolute和移动web布局

　　（1）body降级，子元素升级：

　　　　升级的子div满屏：{position:absolute;top:0;right:0;bottom:0;left:0;}

　　　　子div满屏前提：html,body{height:100%;}

　　（2）各模块-头尾、侧边栏（PC端）各居其位

 header,footer{position:absolute;left:;right:;}

 heder{height:48px;top:;}

 footer{height:52px;bottom:;}

 aside{

     width:250px;

     position:absolute;left:;top:;bottom:;

 }

　　（3）内容区域想象成body

 .content{

     position:absolute;

     top:48px;bottom:52px;

     left:250px; //如果有侧边栏

     overflow:auto;

 }

　　此时的头尾部以及侧边栏都是fixed效果。避免了移动端position:fixed实现的诸多问题。

　　（4）全屏覆盖与page平级

 .overlay{

     position:absolute;

     top:;right:;bottom:;left:;

     background-color:rgba(0,0,0,.5);

     z-index:;

 }

 <div class="page"></div>

 <div class="overlay"></div>

　　（5）实例效果

　　PC：

　　手机：

　　实例代码：

 <!doctype html>

 <html>

 <head>

 <meta charset="utf-8">

 <meta name="viewport" content="width=device-width,initial-scale=1.0,user-scalable=no">

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         <h1>慕课网</h1>

         <a href="javascript:" class="icon-add">添加</a>

         <a href="javascript:" class="icon-search">搜索</a>

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             <a href="http://www.imooc.com/learn/192" class="wechat-list">

                 <img src="http://img.mukewang.com/547d338d00010ced01200120.jpg">

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                     <div class="wechat-h-time"><h5>张鑫旭</h5><time>早上09:51</time></div>

                     <p>CSS深入理解值绝对定位</p>

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             <a href="http://www.imooc.com/learn/192" class="wechat-list">

                 <img src="http://img.mukewang.com/547d338d00010ced01200120.jpg">

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                     <div class="wechat-h-time"><h5>张鑫旭</h5><time>早上09:38</time></div>

                     <p>如果高度不够，可以手动缩小浏览器高度</p>

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             <a href="http://www.imooc.com/learn/192" class="wechat-list">

                 <img src="http://img.mukewang.com/547d338d00010ced01200120.jpg">

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                     <div class="wechat-h-time"><h5>张鑫旭</h5><time>早上08:47</time></div>

                     <p>此demo是本系列最后一个demo</p>

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             <a href="http://www.imooc.com/learn/192" class="wechat-list">

                 <img src="http://img.mukewang.com/547d338d00010ced01200120.jpg">

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                     <div class="wechat-h-time"><h5>张鑫旭</h5><time>早上08:36</time></div>

                     <p>此demo需要在高级浏览器中查看</p>

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             <a href="http://www.imooc.com/learn/192" class="wechat-list">

                 <img src="http://img.mukewang.com/547d338d00010ced01200120.jpg">

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                     <div class="wechat-h-time"><h5>张鑫旭</h5><time>昨天</time></div>

                     <p>重在原理展示，结构可多变。例如，header放在page外面~~</p>

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             <a href="https://github.com/zhangxinxu/mobilebone" class="wechat-list">

                 <img src="http://img.mukewang.com/547d338d00010ced01200120.jpg">

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                     <div class="wechat-h-time"><h5>张鑫旭</h5><time>昨天</time></div>

                     <p>最近鄙人整了个名叫Mobilebone的开源项目</p>

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             <a href="https://github.com/zhangxinxu/mobilebone" class="wechat-list">

                 <img src="http://img.mukewang.com/547d338d00010ced01200120.jpg">

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                     <div class="wechat-h-time"><h5>张鑫旭</h5><time>星期三</time></div>

                     <p>就是依赖绝对定位整体布局，大家可以前去围观</p>

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             <a href="http://www.imooc.com/learn/192" class="wechat-list">

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                     <div class="wechat-h-time"><h5 class="business">慕课网</h5><time>星期三</time></div>

                     <p><img src="http://img.mukewang.com/547d33a00001299b00320033.jpg" width="16" height="16"></p>

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             <a href="http://www.imooc.com/learn/121" class="wechat-list">

                 <img src="http://img.mukewang.com/547d338d00010ced01200120.jpg">

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                     <div class="wechat-h-time"><h5>张鑫旭</h5><time>星期三</time></div>

                     <p>CSS深入理解之浮动</p>

                 </div>

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             <a href="http://www.imooc.com/learn/121" class="wechat-list">

                 <img src="http://img.mukewang.com/547d338d00010ced01200120.jpg">

                 <div class="cell">

                     <div class="wechat-h-time"><h5>张鑫旭</h5><time>上周</time></div>

                     <p>同样精彩，欢迎支持~</p>

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             <i class="icon-mes"></i>我的课程

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 /* wechat.css */

 body {

     margin:;

     -webkit-user-select: none;

     user-select: none;

     -ms-touch-action: none;

 }

 /* construction */

 html, body, .page {

     height: 100%; width: 100%;

     overflow: hidden;

 }

 .page {

     position: absolute; left:; top:;

 }

 body { background-color: #ebebeb; font-family: "Helvetica Neue", Helvetica, STHeiTi, sans-serif; }

 a { text-decoration: none; -webkit-tap-highlight-color: rgba(0,0,0,0); }

 h1,h2,h3,h4,h5,h6{ margin:; font-weight:; }

 ul,ol{ margin:; list-style-type: none; }

 .header, .footer, .content { position: absolute; left:; right:; }

 .header { height: 48px; padding: 0 5px; background-color: #21292B; color: #fff; top:; z-index:; }

 .header > h1 { line-height: 48px; margin: 0 0 0 10px; font-size: 18px; float: left; }

 .header > a { display: inline-block; width: 48px; height: 48px; background-size: 48px 144px; text-indent: -9em; overflow: hidden; }

 .header > .icon-search, .header > .icon-add { float: right; }

 .footer { height: 52px; border-top: 1px solid #dfdfdf; background-color: #fcfcfc; bottom:; z-index:; }

 .footer > a { width: 25%; text-align: center; color: #999; float: left; font-size: 14px; }

 .footer > a > i { display: block; height: 35px; margin-bottom: -3px; background-size: 35px 280px; }

 .footer > .active { color: #45c018; }

 .content { top: 48px; bottom: 53px; overflow: auto; }

 .icon-search, .icon-back, .icon-add { background: url(http://img.mukewang.com/547d339b000188bb00960288.png) no-repeat; }

 .icon-back { background-position: 0 -96px; }

 .icon-add { background-position: 0 -48px; }

 .icon-wechat, .icon-contacts, .icon-finds, .icon-mes { background: url(http://img.mukewang.com/547d33970001444d00700560.png) no-repeat center top; }

 .active .icon-wechat { background-position: center -35px; }

 .icon-contacts { background-position: center -70px; }

 .active .icon-contacts { background-position: center -105px; }

 .icon-finds  { background-position: center -140px; }

 .active .icon-finds { background-position: center -175px; }

 .icon-mes  { background-position: center -210px; }

 .active .icon-mes { background-position: center -245px; }

 .icon-find { background: url(icon-find.png) no-repeat; background-size: 28px 210px; }

 .icon-find-2 { background-position: 0 -30px; }

 .icon-find-3 { background-position: 0 -60px; }

 .icon-find-4 { background-position: 0 -90px; }

 .icon-find-5 { background-position: 0 -120px; }

 .icon-find-6 { background-position: 0 -150px; }

 .icon-find-7 { background-position: 0 -180px; }

 .icon-me { background: url(icon-me.png) no-repeat; background-size: 28px 120px; }

 .icon-me-2 { background-position: 0 -30px; }

 .icon-me-3 { background-position: 0 -60px; }

 .icon-me-4 { background-position: 0 -90px; }

 .wechat-list { display: block; height: 64px; padding: 8px 12px; box-sizing: border-box; border-bottom: 1px solid #d7d7d7; background-color: #fff; }

 .wechat-list:last-child { border-bottom:; }

 .wechat-list > img { width: 48px; height: 48px; float: left; }

 .wechat-list > .cell { padding-left: 58px; line-height: 24px; color: #333; }

 .wechat-h-time { overflow: hidden; }

 .wechat-h-time > h5 { font-size: 100%; float: left; }

 .wechat-h-time > time { font-size: 12px; color: #b9b9b9; float: right; }

 .wechat-h-time .business { color: #54688D; }

 .wechat-h-time + p { margin: 0 20px 0 0; font-size: 14px; color: #a8a8a8; white-space: nowrap; text-overflow: ellipsis; overflow: hidden; }

 .wechat-detail { position: relative; z-index:; }

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