常用的前端JavaScript方法封装
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) { obj = 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]) { str += this; obj] = 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 == 'object' && obj !== null) { // 引用值(obj/array)且不为null if (Object.prototype.toString.call(obj) == '') { // 对象 result = {}; } else { // 数组 result = []; } deepClone(obj, result) } else { // 原始值或func result = obj }}}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) == '') { // 数组 result = [] } else { // 对象 result = {}; } for (var prop in target) { if (target.hasOwnProperty(prop)) { result = deepClone(target) } } return result;}// 无法复制函数var o1 = jsON.parse(jsON.stringify(obj1));5、reverse底层原理和扩展
// 改变原数组Array.prototype.myReverse = function () { var len = this.length; for (var i = 0; i < len; i++) { var temp = this; this = this; this = temp; } return this;}6、圣杯模式的继承
function inherit(Target, Origin) { function F() {}; F.prototype = Origin.prototype; Target.prototype = new F(); Target.prototype.constructor = Target; // 最终的原型指向 Target.prop.uber = Origin.prototype;}7、找出字符串中第一次只出现一次的字母
String.prototype.firstAppear = function () { var obj = {}, len = this.length; for (var i = 0; i < len; i++) { if (obj]) { obj]++; } else { obj] = 1; } } for (var prop in obj) { if (obj == 1) { return prop; } }}8、找元素的第n级父元素
function parents(ele, n) { while (ele && n) { ele = ele.parentElement ? ele.parentElement : ele.parentNode; n--; } return ele;}9、 返回元素的第n个兄弟节点
function retSibling(e, n) { while (e && n) { if (n > 0) { if (e.nextElementSibling) { e = e.nextElementSibling; } else { for (e = e.nextSibling; e && e.nodeType !== 1; e = e.nextSibling); } n--; } else { if (e.previousElementSibling) { e = e.previousElementSibling; } else { for (e = e.previousElementSibling; e && e.nodeType !== 1; e = e.previousElementSibling); } n++; } } return e;}10、封装mychildren，解决浏览器的兼容问题
function myChildren(e) { var children = e.childNodes, arr = [], len = children.length; for (var i = 0; i < len; i++) { if (children.nodeType === 1) { arr.push(children) } } return arr;}11、判断元素有没有子元素
function hasChildren(e) { var children = e.childNodes, len = children.length; for (var i = 0; i < len; i++) { if (children.nodeType === 1) { return true; } } return false;}12、我一个元素插入到另一个元素的后面
Element.prototype.insertAfter = function (target, elen) { var nextElen = elen.nextElenmentSibling; if (nextElen == null) { this.appendChild(target); } else { this.insertBefore(target, nextElen); }}13、返回当前的时间（年月日时分秒）
function getDateTime() { var date = new Date(), year = date.getFullYear(), month = date.getMonth() + 1, day = date.getDate(), hour = date.getHours() + 1, minute = date.getMinutes(), second = date.getSeconds(); month = checkTime(month); day = checkTime(day); hour = checkTime(hour); minute = checkTime(minute); second = checkTime(second); function checkTime(i) { if (i < 10) { i = "0" + i; } return i; } return "" + year + "年" + month + "月" + day + "日" + hour + "时" + minute + "分" + second + "秒"}14、获得滚动条的滚动距离
function getScrollOffset() { if (window.pageXOffset) { return { x: window.pageXOffset, y: window.pageYOffset } } else { return { x: document.body.scrollLeft + document.documentElement.scrollLeft, y: document.body.scrollTop + document.documentElement.scrollTop } }}15、获得视口的尺寸
function getViewportOffset() { if (window.innerWidth) { return { w: window.innerWidth, h: window.innerHeight } } else { // ie8及其以下 if (document.compatMode === "BackCompat") { // 怪异模式 return { w: document.body.clientWidth, h: document.body.clientHeight } } else { // 标准模式 return { w: document.documentElement.clientWidth, h: document.documentElement.clientHeight } } }}16、获取任一元素的任意属性
function getStyle(elem, prop) { return window.getComputedStyle ? window.getComputedStyle(elem, null) : elem.currentStyle}17、绑定事件的兼容代码
function addEvent(elem, type, handle) { if (elem.addEventListener) { //非ie和非ie9 elem.addEventListener(type, handle, false); } else if (elem.attachEvent) { //ie6到ie8 elem.attachEvent('on' + type, function () { handle.call(elem); }) } else { elem['on' + type] = handle; }}18、解绑事件
function removeEvent(elem, type, handle) { if (elem.removeEventListener) { //非ie和非ie9 elem.removeEventListener(type, handle, false); } else if (elem.detachEvent) { //ie6到ie8 elem.detachEvent('on' + type, handle); } else { elem['on' + type] = null; }}19、取消冒泡的兼容代码
function stopBubble(e) { if (e && e.stopPropagation) { e.stopPropagation(); } else { window.event.cancelBubble = true; }}20、检验字符串是否是回文
function isPalina(str) { if (Object.prototype.toString.call(str) !== '') { return false; } var len = str.length; for (var i = 0; i < len / 2; i++) { if (str != str) { return false; } } return true;}21、检验字符串是否是回文
function isPalindrome(str) { str = str.replace(/\W/g, '').toLowerCase(); console.log(str) return (str == str.split('').reverse().join(''))}22、兼容getElementsByClassName方法
Element.prototype.getElementsByClassName = Document.prototype.getElementsByClassName = function (_className) { var allDomArray = document.getElementsByTagName('*'); var lastDomArray = []; function trimSpace(strClass) { var reg = /\s+/g; return strClass.replace(reg, ' ').trim() } for (var i = 0; i < allDomArray.length; i++) { var classArray = trimSpace(allDomArray.className).split(' '); for (var j = 0; j < classArray.length; j++) { if (classArray == _className) { lastDomArray.push(allDomArray); break; } } } return lastDomArray;}23、运动函数
function animate(obj, json, callback) { clearInterval(obj.timer); var speed, current; obj.timer = setInterval(function () { var lock = true; for (var prop in json) { if (prop == 'opacity') { current = parseFloat(window.getComputedStyle(obj, null)) * 100; } else { current = parseInt(window.getComputedStyle(obj, null)); } speed = (json - current) / 7; speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed); if (prop == 'opacity') { obj.style = (current + speed) / 100; } else { obj.style = current + speed + 'px'; } if (current != json) { lock = false; } } if (lock) { clearInterval(obj.timer); typeof callback == 'function' ? callback() : ''; } }, 30)}24、弹性运动
function ElasticMovement(obj, target) { clearInterval(obj.timer); var iSpeed = 40, a, u = 0.8; obj.timer = setInterval(function () { a = (target - obj.offsetLeft) / 8; iSpeed = iSpeed + a; iSpeed = iSpeed * u; if (Math.abs(iSpeed)
页:
[1]