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}}}}