1、输入一个值,返回其数据类型
function type(para) { return Object.prototype.toString.call(para) }
2、数组去重
function unique1(arr) { return [new Set(arr)] } function unique2(arr) { var obj = {}; return arr.filter(ele => { if (!obj[ele]) { obj[ele] = true; return true; } }) } function unique3(arr) { var result = []; arr.forEach(ele => { if (result.indexOf(ele) == -1) { result.push(ele) } }) return result; }
3、字符串去重
String.prototype.unique = function () { var obj = {}, str = '', len = this.length; for (var i = 0; i < len; i++) { if (!obj[this[i]]) { str += this[i]; obj[this[i]] = true; } } return str; } // 去除连续的字符串 function uniq(str) { return str.replace(/(\w)\1+/g, '$1') }
4、深拷贝 浅拷贝
//深克隆(深克隆不考虑函数) function deepClone(obj, result) { var result = result || {}; for (var prop in obj) { if (obj.hasOwnProperty(prop)) { if (typeof obj[prop] == 'object' && obj[prop] !== null) { // 引用值(obj/array)且不为null if (Object.prototype.toString.call(obj[prop]) == '[object Object]') { // 对象 result[prop] = {}; } else { // 数组 result[prop] = []; } deepClone(obj[prop], result[prop]) } else { // 原始值或func result[prop] = obj[prop] } } } return result; } // 深浅克隆是针对引用值 function deepClone(target) { if (typeof (target) !== 'object') { return target; } var result; if (Object.prototype.toString.call(target) == '[object Array]') { // 数组 result = [] } else { // 对象 result = {}; } for (var prop in target) { if (target.hasOwnProperty(prop)) { result[prop] = deepClone(target[prop]) } } return result; } // 无法复制函数 var o1 = JSON.parse(JSON.stringify(obj1));
5、返回当前的时间(年月日时分秒)
6、获取url中的参数
function getWindonHref() { var sHref = window.location.href; var args = sHref.split('?'); if (args[0] === sHref) { return ''; } var hrefarr = args[1].split('#')[0].split('&'); var obj = {}; for (var i = 0; i < hrefarr.length; i++) { hrefarr[i] = hrefarr[i].split('='); obj[hrefarr[i][0]] = hrefarr[i][1]; } return obj; }
7、数组排序
// 快排 [left] + min + [right] function quickArr(arr) { if (arr.length <= 1) { return arr; } var left = [], right = []; var pIndex = Math.floor(arr.length / 2); var p = arr.splice(pIndex, 1)[0]; for (var i = 0; i < arr.length; i++) { if (arr[i] <= p) { left.push(arr[i]); } else { right.push(arr[i]); } } // 递归 return quickArr(left).concat([p], quickArr(right)); } // 冒泡 function bubbleSort(arr) { for (var i = 0; i < arr.length - 1; i++) { for (var j = i + 1; j < arr.length; j++) { if (arr[i] > arr[j]) { var temp = arr[i]; arr[i] = arr[j]; arr[j] = temp; } } } return arr; } function bubbleSort(arr) { var len = arr.length; for (var i = 0; i < len - 1; i++) { for (var j = 0; j < len - 1 - i; j++) { if (arr[j] > arr[j + 1]) { var temp = arr[j]; arr[j] = arr[j + 1]; arr[j + 1] = temp; } } } return arr; }
8、防抖
function debounce(handle, delay) { var timer = null; return function () { var _self = this, _args = arguments; clearTimeout(timer); timer = setTimeout(function () { handle.apply(_self, _args) }, delay) } }
9、节流
function throttle(handler, wait) { var lastTime = 0; return function (e) { var nowTime = new Date().getTime(); if (nowTime - lastTime > wait) { handler.apply(this, arguments); lastTime = nowTime; } } }
10、封装自己的filter方法
Array.prototype.myFilter = function (func, obj) { var len = this.length; var arr = []; var _this = arguments[1] || window; for (var i = 0; i < len; i++) { func.call(_this, this[i], i, this) && arr.push(this[i]); } return arr; }