常用的前端JavaScript方法封装

这些方法都是转载来的，来自作者：小蘑菇
链接：https://segmentfault.com/a/1190000039220666
之所以转载是因为比较喜欢简书的代码风格

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nullif (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funcresult[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、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[i];this[i] = this[len - 1 - i];this[len - 1 - i] = 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[this[i]]) {obj[this[i]]++;} else {obj[this[i]] = 1;}}for (var prop in obj) {if (obj[prop] == 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[i].nodeType === 1) {arr.push(children[i])}}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[i].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)[prop] : elem.currentStyle[prop]
}

17、绑定事件的兼容代码

function addEvent(elem, type, handle) {if (elem.addEventListener) { //非ie和非ie9elem.addEventListener(type, handle, false);} else if (elem.attachEvent) { //ie6到ie8elem.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ie9elem.removeEventListener(type, handle, false);} else if (elem.detachEvent) { //ie6到ie8elem.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) !== '[object String]') {return false;}var len = str.length;for (var i = 0; i < len / 2; i++) {if (str[i] != str[len - 1 - i]) {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[i].className).split(' ');for (var j = 0; j < classArray.length; j++) {if (classArray[j] == _className) {lastDomArray.push(allDomArray[i]);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)[prop]) * 100;} else {current = parseInt(window.getComputedStyle(obj, null)[prop]);}speed = (json[prop] - current) / 7;speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);if (prop == 'opacity') {obj.style[prop] = (current + speed) / 100;} else {obj.style[prop] = current + speed + 'px';}if (current != json[prop]) {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) <= 1 && Math.abs(a) <= 1) {console.log('over')clearInterval(obj.timer);obj.style.left = target + 'px';} else {obj.style.left = obj.offsetLeft + iSpeed + 'px';}}, 30);
}

25、封装自己的forEach方法

Array.prototype.myForEach = function (func, obj) {var len = this.length;var _this = arguments[1] ? arguments[1] : window;// var _this=arguments[1]||window;for (var i = 0; i < len; i++) {func.call(_this, this[i], i, this)}
}

26、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;
}

27、数组map方法

Array.prototype.myMap = function (func) {var arr = [];var len = this.length;var _this = arguments[1] || window;for (var i = 0; i < len; i++) {arr.push(func.call(_this, this[i], i, this));}return arr;
}

28、数组every方法

Array.prototype.myEvery = function (func) {var flag = true;var len = this.length;var _this = arguments[1] || window;for (var i = 0; i < len; i++) {if (func.apply(_this, [this[i], i, this]) == false) {flag = false;break;}}return flag;
}

29、数组reduce方法

Array.prototype.myReduce = function (func, initialValue) {var len = this.length,nextValue,i;if (!initialValue) {// 没有传第二个参数nextValue = this[0];i = 1;} else {// 传了第二个参数nextValue = initialValue;i = 0;}for (; i < len; i++) {nextValue = func(nextValue, this[i], i, this);}return nextValue;
}

30、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;
}

31、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;
}

32、遍历Dom树

// 给定页面上的DOM元素,将访问元素本身及其所有后代(不仅仅是它的直接子元素)
// 对于每个访问的元素，函数讲元素传递给提供的回调函数
function traverse(element, callback) {callback(element);var list = element.children;for (var i = 0; i < list.length; i++) {traverse(list[i], callback);}
}

33、原生js封装ajax

function ajax(method, url, callback, data, flag) {var xhr;flag = flag || true;method = method.toUpperCase();if (window.XMLHttpRequest) {xhr = new XMLHttpRequest();} else {xhr = new ActiveXObject('Microsoft.XMLHttp');}xhr.onreadystatechange = function () {if (xhr.readyState == 4 && xhr.status == 200) {console.log(2)callback(xhr.responseText);}}if (method == 'GET') {var date = new Date(),timer = date.getTime();xhr.open('GET', url + '?' + data + '&timer' + timer, flag);xhr.send()} else if (method == 'POST') {xhr.open('POST', url, flag);xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');xhr.send(data);}
}

34、异步加载script

function loadScript(url, callback) {var oscript = document.createElement('script');if (oscript.readyState) { // ie8及以下版本oscript.onreadystatechange = function () {if (oscript.readyState === 'complete' || oscript.readyState === 'loaded') {callback();}}} else {oscript.onload = function () {callback()};}oscript.src = url;document.body.appendChild(oscript);
}

35、cookie管理

var cookie = {set: function (name, value, time) {document.cookie = name + '=' + value + '; max-age=' + time;return this;},remove: function (name) {return this.setCookie(name, '', -1);},get: function (name, callback) {var allCookieArr = document.cookie.split('; ');for (var i = 0; i < allCookieArr.length; i++) {var itemCookieArr = allCookieArr[i].split('=');if (itemCookieArr[0] === name) {return itemCookieArr[1]}}return undefined;}
}

36、实现bind()方法

Function.prototype.myBind = function (target) {var target = target || window;var _args1 = [].slice.call(arguments, 1);var self = this;var temp = function () {};var F = function () {var _args2 = [].slice.call(arguments, 0);var parasArr = _args1.concat(_args2);return self.apply(this instanceof temp ? this : target, parasArr)}temp.prototype = self.prototype;F.prototype = new temp();return F;
}

37、实现call()方法

Function.prototype.myCall = function () {var ctx = arguments[0] || window;ctx.fn = this;var args = [];for (var i = 1; i < arguments.length; i++) {args.push(arguments[i])}var result = ctx.fn(...args);delete ctx.fn;return result;
}

38、实现apply()方法

Function.prototype.myApply = function () {var ctx = arguments[0] || window;ctx.fn = this;if (!arguments[1]) {var result = ctx.fn();delete ctx.fn;return result;}var result = ctx.fn(...arguments[1]);delete ctx.fn;return result;
}

39、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)}
}

40、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;}}
}

41、requestAnimFrame兼容性方法

window.requestAnimFrame = (function () {return window.requestAnimationFrame ||window.webkitRequestAnimationFrame ||window.mozRequestAnimationFrame ||function (callback) {window.setTimeout(callback, 1000 / 60);};
})();

42、cancelAnimFrame兼容性方法

window.cancelAnimFrame = (function () {return window.cancelAnimationFrame ||window.webkitCancelAnimationFrame ||window.mozCancelAnimationFrame ||function (id) {window.clearTimeout(id);};
})();

43、jsonp底层方法

function jsonp(url, callback) {var oscript = document.createElement('script');if (oscript.readyState) { // ie8及以下版本oscript.onreadystatechange = function () {if (oscript.readyState === 'complete' || oscript.readyState === 'loaded') {callback();}}} else {oscript.onload = function () {callback()};}oscript.src = url;document.body.appendChild(oscript);
}

44、获取url上的参数

function getUrlParam(sUrl, sKey) {var result = {};sUrl.replace(/(\w+)=(\w+)(?=[&|#])/g, function (ele, key, val) {if (!result[key]) {result[key] = val;} else {var temp = result[key];result[key] = [].concat(temp, val);}})if (!sKey) {return result;} else {return result[sKey] || '';}
}

45、格式化时间

function formatDate(t, str) {var obj = {yyyy: t.getFullYear(),yy: ("" + t.getFullYear()).slice(-2),M: t.getMonth() + 1,MM: ("0" + (t.getMonth() + 1)).slice(-2),d: t.getDate(),dd: ("0" + t.getDate()).slice(-2),H: t.getHours(),HH: ("0" + t.getHours()).slice(-2),h: t.getHours() % 12,hh: ("0" + t.getHours() % 12).slice(-2),m: t.getMinutes(),mm: ("0" + t.getMinutes()).slice(-2),s: t.getSeconds(),ss: ("0" + t.getSeconds()).slice(-2),w: ['日', '一', '二', '三', '四', '五', '六'][t.getDay()]};return str.replace(/([a-z]+)/ig, function ($1) {return obj[$1]});
}

46、验证邮箱的正则表达式

function isAvailableEmail(sEmail) {var reg = /^([\w+\.])+@\w+([.]\w+)+$/return reg.test(sEmail)
}

47、函数柯里化

//是把接受多个参数的函数变换成接受一个单一参数(最初函数的第一个参数)的函数，并且返回接受余下的参数且返回结果的新函数的技术function curryIt(fn) {var length = fn.length,args = [];var result = function (arg) {args.push(arg);length--;if (length <= 0) {return fn.apply(this, args);} else {return result;}}return result;
}

48、大数相加

function sumBigNumber(a, b) {var res = '', //结果temp = 0; //按位加的结果及进位a = a.split('');b = b.split('');while (a.length || b.length || temp) {//~~按位非 1.类型转换，转换成数字 2.~~undefined==0 temp += ~~a.pop() + ~~b.pop();res = (temp % 10) + res;temp = temp > 9;}return res.replace(/^0+/, '');
}

49、单例模式

function getSingle(func) {var result;return function () {if (!result) {result = new func(arguments);}return result;}
}

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