常用的前端JavaScript方法封装
常用的前端JavaScript方法封装:https://blog.csdn.net/qq_31967569/article/details/82461499
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、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) !== '[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（1）
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（1）
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（2）
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; } } 50、加载js || css || style
const loadRes = function(name, type, fn) { // 加载js || css || style let ref if (type === 'js') { // 外部js ref = document.createElement('script') ref.setAttribute('type', 'text/JavaScript') ref.setAttribute('src', name) } else if (type === 'css') { // 外部css ref = document.createElement('link') ref.setAttribute('rel', 'stylesheet') ref.setAttribute('type', 'text/css') ref.setAttribute('href', name) } else if (type === 'style') { // style ref = document.createElement('style') ref.innerhtml = name } if (typeof ref !== 'undefined') { document.getElementsByTagName('head')[0].appendChild(ref) ref.onload = function() { // 加载完成执行 typeof fn === 'function' && fn() } } } 51、获取url参数（3）
const getUrlParam = function(name) { // 获取url参数 let reg = new RegExp('(^|&?)' + name + '=([^&]*)(&|$)', 'i') let r = window.location.href.substr(1).match(reg) if (r != null) { return decodeURI(r[2]) } return undefined } 52、本地存储
const store = { // 本地存储 set: function(name, value, day) { // 设置 let d = new Date() let time = 0 day = (typeof(day) === 'undefined' || !day) ? 1 : day // 时间,默认存储1天 time = d.setHours(d.getHours() + (24 * day)) // 毫秒 localStorage.setItem(name, JSON.stringify({ data: value, time: time })) }, get: function(name) { // 获取 let data = localStorage.getItem(name) if (!data) { return null } let obj = JSON.parse(data) if (new Date().getTime() > obj.time) { // 过期 localStorage.removeItem(name) return null } else { return obj.data } }, clear: function(name) { // 清空 if (name) { // 删除键为name的缓存 localStorage.removeItem(name) } else { // 清空全部 localStorage.clear() } } } 53、cookie操作【set，get，del】
const cookie = { // cookie操作【set，get，del】 set: function(name, value, day) { let oDate = new Date() oDate.setDate(oDate.getDate() + (day || 30)) document.cookie = name + '=' + value + ';expires=' + oDate + ; path=/; }, get: function(name) { let str = document.cookie let arr = str.split('; ') for (let i = 0; i < arr.length; i++) { let newArr = arr[i].split('=') if (newArr[0] === name) { return newArr[1] } } }, del: function(name) { this.set(name, '', -1) } } 54、Js获取元素样式【支持内联】
const getRealStyle = function(obj, styleName) { // Js获取元素样式【支持内联】 var realStyle = null if (obj.currentStyle) { realStyle = obj.currentStyle[styleName] } else if (window.getComputedStyle) { realStyle = window.getComputedStyle(obj, null)[styleName] } return realStyle } 55、时间格式化
const formatDate = function(fmt, date) { // 时间格式化 【'yyyy-MM-dd hh:mm:ss',时间】 if (typeof date !== 'object') { date = !date ? new Date() : new Date(date) } var o = { 'M+': date.getMonth() + 1, // 月份 'd+': date.getDate(), // 日 'h+': date.getHours(), // 小时 'm+': date.getMinutes(), // 分 's+': date.getSeconds(), // 秒 'q+': Math.floor((date.getMonth() + 3) / 3), // 季度 'S': date.getMilliseconds() // 毫秒 } if (/(y+)/.test(fmt)) { fmt = fmt.replace(RegExp.$1, (date.getFullYear() + '').substr(4 - RegExp.$1.length)) } for (var k in o) { if (new RegExp('(' + k + ')').test(fmt)) { fmt = fmt.replace(RegExp.$1, (RegExp.$1.length === 1) ? (o[k]) : (('00' + o[k]).substr(('' + o[k]).length))) } } return fmt } 56、原生ajax操作（2）
const ajax = function(conf) { // ajax操作 let url = conf.url, data = conf.data, senData = [], // 封装后的数据 async = conf.async !== undefined ? conf.async : true, // ture为异步请求 type = conf.type || 'get', // 默认请求方式get dataType = conf.dataType || 'json', contenType = conf.contenType || 'application/x-www-form-urlencoded', success = conf.success, error = conf.error, isForm = conf.isForm || false, // 是否formdata header = conf.header || {}, // 头部信息 xhr = '' // 创建ajax引擎对象 if (data == null) { senData = '' } else if (typeof data === 'object' && !isForm) { // 如果data是对象，转换为字符串 for (var k in data) { senData.push(encodeURIComponent(k) + '=' + encodeURIComponent(data[k])) } senData = senData.join('&') } else { senData = data } try { xhr = new ActiveXObject('microsoft.xmlhttp') // IE内核系列浏览器 } catch (e1) { try { xhr = new XMLHttpRequest() // 非IE内核浏览器 } catch (e2) { if (error != null) { error('不支持ajax请求') } } }; xhr.open(type, type !== 'get' ? url : url + '?' + senData, async) if (type !== 'get' && !isForm) { xhr.setRequestHeader('content-type', contenType) } for (var h in header) { xhr.setRequestHeader(h, header[h]) } xhr.send(type !== 'get' ? senData : null) xhr.onreadystatechange = function() { if (xhr.readyState === 4) { if (xhr.status >= 200 && xhr.status < 300) { if (dataType === 'json' && success != null) { let res = '' try { res = eval('(' + xhr.responseText + ')') } catch (e) { console.log(e) } success(res) // 将json字符串转换为js对象 }; } else { if (error != null) { error('通讯失败!' + xhr.status) } } } } } 57、fetch请求的封装
const fetch = function(url, setting) { // fetch请求的封装 let opts = { // 设置参数的初始值 method: (setting.method || 'GET').toUpperCase(), // 请求方式 headers: setting.headers || {}, // 请求头设置 credentials: setting.credentials || true, // 设置cookie是否一起发送 body: setting.body || {}, mode: setting.mode || 'no-cors', // 可以设置 cors, no-cors, same-origin redirect: setting.redirect || 'follow', // follow, error, manual cache: setting.cache || 'default' // 设置 cache 模式 (default, reload, no-cache) } let dataType = setting.dataType || 'json' // 解析方式 let data = setting.data || '' // 参数 let paramsFormat = function(obj) { // 参数格式 var str = '' for (var i in obj) { str += `${i}=${obj[i]}&` } return str.split('').slice(0, -1).join('') } if (opts.method === 'GET') { url = url + (data ? `?${paramsFormat(data)}` : '') } else { setting.body = data || {} } return new Promise((resolve, reject) => { fetch(url, opts).then(async res => { let data = dataType === 'text' ? await res.text() : dataType === 'blob' ? await res.blob() : await res.json() resolve(data) }).catch(e => { reject(e) }) }) } 58、设备判断：android、ios、web
const isDevice = function() { // 判断是android还是ios还是web var ua = navigator.userAgent.toLowerCase() if (ua.match(/iPhone\sOS/i) === 'iphone os' || ua.match(/iPad/i) === 'ipad') { // ios return 'iOS' } if (ua.match(/Android/i) === 'android') { return 'Android' } return 'Web' } 59、判断是否为微信
const isWx = function() { // 判断是否为微信 var ua = window.navigator.userAgent.toLowerCase() if (ua.match(/MicroMessenger/i) === 'micromessenger') { return true } return false } 60、文本复制功能
const copyTxt = function(text, fn) { // 复制功能 if (typeof document.execCommand !== 'function') { console.log('复制失败，请长按复制') return } var dom = document.createElement('textarea') dom.value = text dom.setAttribute('style', 'display: block;width: 1px;height: 1px;') document.body.appendChild(dom) dom.select() var result = document.execCommand('copy') document.body.removeChild(dom) if (result) { console.log('复制成功') typeof fn === 'function' && fn() return } if (typeof document.createRange !== 'function') { console.log('复制失败，请长按复制') return } var range = document.createRange() var div = document.createElement('div') div.innerhtml = text div.setAttribute('style', 'height: 1px;fontSize: 1px;overflow: hidden;') document.body.appendChild(div) range.selectNode(div) var selection = window.getSelection() console.log(selection) if (selection.rangeCount > 0) { selection.removeAllRanges() } selection.addRange(range) document.execCommand('copy') typeof fn === 'function' && fn() console.log('复制成功') } 61、判断是否是一个数组
const isArray = function(arr) { // 判断是否是一个数组 return Object.prototype.toString.call(arr) === '[object Array]' } 62、判断两个数组是否相等
const arrayEqual = function(arr1, arr2) { //判断两个数组是否相等 if (arr1 === arr2) return true; if (arr1.length != arr2.length) return false; for (let i = 0; i < arr1.length; ++i) { if (arr1[i] !== arr2[i]) return false; } return true; } 63、时间与时间戳转换
const stamp = { // 时间，时间戳转换 getTime: function(time) { // 时间转10位时间戳 let date = time ? new Date(time) : new Date() return Math.round(date.getTime() / 1000) }, timeToStr: function(time, fmt) { // 10位时间戳转时间 return new Date(time * 1000).pattern(fmt || 'yyyy-MM-dd') } } 64、常用正则验证
const checkStr = function(str, type) { // 常用正则验证，注意type大小写 switch (type) { case 'phone': // 手机号码 return /^1[3|4|5|6|7|8|9][0-9]{9}$/.test(str) case 'tel': // 座机 return /^(0\d{2,3}-\d{7,8})(-\d{1,4})?$/.test(str) case 'card': // 身份证 return /(^\d{15}$)|(^\d{18}$)|(^\d{17}(\d|X|x)$)/.test(str) case 'pwd': // 密码以字母开头，长度在6~18之间，只能包含字母、数字和下划线 return /^[a-zA-Z]\w{5,17}$/.test(str) case 'postal': // 邮政编码 return /[1-9]\d{5}(?!\d)/.test(str) case 'QQ': // QQ号 return /^[1-9][0-9]{4,9}$/.test(str) case 'email': // 邮箱 return /^[\w-]+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$/.test(str) case 'money': // 金额(小数点2位) return /^\d*(?:\.\d{0,2})?$/.test(str) case 'URL': // 网址 return /(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?/.test(str) case 'IP': // IP return /((?:(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d)\\.){3}(?:25[0-5]|2[0-4]\\d|[01]?\\d?\\d))/.test(str) case 'date': // 日期时间 return /^(\d{4})\-(\d{2})\-(\d{2}) (\d{2})(?:\:\d{2}|:(\d{2}):(\d{2}))$/.test(str) || /^(\d{4})\-(\d{2})\-(\d{2})$/.test(str) case 'number': // 数字 return /^[0-9]$/.test(str) case 'english': // 英文 return /^[a-zA-Z]+$/.test(str) case 'chinese': // 中文 return /^[\u4E00-\u9FA5]+$/.test(str) case 'lower': // 小写 return /^[a-z]+$/.test(str) case 'upper': // 大写 return /^[A-Z]+$/.test(str) case 'HTML': // HTML标记 return /<([^]*|'[^']*'|[^'>])*>/.test(str) default: return true } } 65、是否为PC端
const isPC = function() { // 是否为PC端 let userAgentInfo = navigator.userAgent let Agents = ['Android', 'iPhone', 'SymbianOS', 'Windows Phone', 'iPad', 'iPod'] let flag = true for (let v = 0; v < Agents.length; v++) { if (userAgentInfo.indexOf(Agents[v]) > 0) { flag = false break } } return flag } 66、去除字符串空格
const trim = function(str, type) { // 去除空格， type: 1-所有空格 2-前后空格 3-前空格 4-后空格 type = type || 1 switch (type) { case 1: return str.replace(/\s+/g, '') case 2: return str.replace(/(^\s*)|(\s*$)/g, '') case 3: return str.replace(/(^\s*)/g, '') case 4: return str.replace(/(\s*$)/g, '') default: return str } } 67、字符串大小写转换
const changeCase = function(str, type) { // 字符串大小写转换 type: 1:首字母大写 2：首页母小写 3：大小写转换 4：全部大写 5：全部小写 type = type || 4 switch (type) { case 1: return str.replace(/\b\w+\b/g, function(word) { return word.substring(0, 1).toUpperCase() + word.substring(1).toLowerCase() }) case 2: return str.replace(/\b\w+\b/g, function(word) { return word.substring(0, 1).toLowerCase() + word.substring(1).toUpperCase() }) case 3: return str.split('').map(function(word) { if (/[a-z]/.test(word)) { return word.toUpperCase() } else { return word.toLowerCase() } }).join('') case 4: return str.toUpperCase() case 5: return str.toLowerCase() default: return str } } 68、过滤html代码
const filterTag = function(str) { // 过滤html代码(把<>转换) str = str.replace(/&/ig, '&') str = str.replace(/</ig, '<') str = str.replace(/>/ig, '>') str = str.replace(' ', ' ') return str } 69、生成随机数范围
const random = function(min, max) { // 生成随机数范围 if (arguments.length === 2) { return Math.floor(min + Math.random() * ((max + 1) - min)) } else { return null } } 70、阿拉伯数字转中文大写数字
const numberToChinese = function(num) { // 将阿拉伯数字翻译成中文的大写数字 let AA = new Array('零', '一', '二', '三', '四', '五', '六', '七', '八', '九', '十') let BB = new Array('', '十', '百', '仟', '萬', '億', '点', '') let a = ('' + num).replace(/(^0*)/g, '').split('.') let k = 0 let re = '' for (let i = a[0].length - 1; i >= 0; i--) { switch (k) { case 0: re = BB[7] + re break case 4: if (!new RegExp('0{4}//d{' + (a[0].length - i - 1) + '}$').test(a[0])) { re = BB[4] + re } break case 8: re = BB[5] + re BB[7] = BB[5] k = 0 break } if (k % 4 === 2 && a[0].charAt(i + 2) !== 0 && a[0].charAt(i + 1) === 0) { re = AA[0] + re } if (a[0].charAt(i) !== 0) { re = AA[a[0].charAt(i)] + BB[k % 4] + re } k++ } if (a.length > 1) { // 加上小数部分(如果有小数部分) re += BB[6] for (let i = 0; i < a[1].length; i++) { re += AA[a[1].charAt(i)] } } if (re === '一十') { re = '十' } if (re.match(/^一/) && re.length === 3) { re = re.replace('一', '') } return re } 71、原生dom操作
const dom = { $: function(selector) { let type = selector.substring(0, 1) if (type === '#') { if (document.querySelecotor) return document.querySelector(selector) return document.getElementById(selector.substring(1)) } else if (type === '.') { if (document.querySelecotorAll) return document.querySelectorAll(selector) return document.getElementsByClassName(selector.substring(1)) } else { return document['querySelectorAll' ? 'querySelectorAll' : 'getElementsByTagName'](selector) } }, hasClass: function(ele, name) { /* 检测类名 */ return ele.className.match(new RegExp('(\\s|^)' + name + '(\\s|$)')) }, addClass: function(ele, name) { /* 添加类名 */ if (!this.hasClass(ele, name)) ele.className += ' ' + name }, removeClass: function(ele, name) { /* 删除类名 */ if (this.hasClass(ele, name)) { let reg = new RegExp('(\\s|^)' + name + '(\\s|$)') ele.className = ele.className.replace(reg, '') } }, replaceClass: function(ele, newName, oldName) { /* 替换类名 */ this.removeClass(ele, oldName) this.addClass(ele, newName) }, siblings: function(ele) { /* 获取兄弟节点 */ console.log(ele.parentNode) let chid = ele.parentNode.children, eleMatch = [] for (let i = 0, len = chid.length; i < len; i++) { if (chid[i] !== ele) { eleMatch.push(chid[i]) } } return eleMatch }, getByStyle: function(obj, name) { /* 获取行间样式属性 */ if (obj.currentStyle) { return obj.currentStyle[name] } else { return getComputedStyle(obj, false)[name] } }, domToStirng: function(htmlDOM) { /* DOM转字符串 */ var div = document.createElement('div') div.appendChild(htmlDOM) return div.innerHTML }, stringToDom: function(htmlString) { /* 字符串转DOM */ var div = document.createElement('div') div.innerHTML = htmlString return div.children[0] } } 72、判断图片加载完成
const imgLoadAll = function(arr, callback) { // 图片加载 let arrImg = [] for (let i = 0; i < arr.length; i++) { let img = new Image() img.src = arr[i] img.onload = function() { arrImg.push(this) if (arrImg.length == arr.length) { callback && callback() } } } } 73、音频加载完成操作
const loadAudio = function(src, callback) { // 音频加载 var audio = new Audio(src) audio.onloadedmetadata = callback audio.src = src } 74、光标所在位置插入字符
const insertAtCursor = function(dom, val) { // 光标所在位置插入字符 if (document.selection) { dom.focus() let sel = document.selection.createRange() sel.text = val sel.select() } else if (dom.selectionStart || dom.selectionStart == '0') { let startPos = dom.selectionStart let endPos = dom.selectionEnd let restoreTop = dom.scrollTop dom.value = dom.value.substring(0, startPos) + val + dom.value.substring(endPos, dom.value.length) if (restoreTop > 0) { dom.scrollTop = restoreTop } dom.focus() dom.selectionStart = startPos + val.length dom.selectionEnd = startPos + val.length } else { dom.value += val dom.focus() } } 75、图片地址转base64
const getBase64 = function(img) { //传入图片路径，返回base64，使用getBase64(url).then(function(base64){},function(err){}); let getBase64Image = function(img, width, height) { //width、height调用时传入具体像素值，控制大小,不传则默认图像大小 let canvas = document.createElement(canvas); canvas.width = width ? width : img.width; canvas.height = height ? height : img.height; let ctx = canvas.getContext(2d); ctx.drawImage(img, 0, 0, canvas.width, canvas.height); let dataURL = canvas.toDataURL(); return dataURL; } let image = new Image(); image.crossOrigin = ''; image.src = img; let deferred = $.Deferred(); if (img) { image.onload = function() { deferred.resolve(getBase64Image(image)); } return deferred.promise(); } } 76、base64图片下载功能
const downloadFile = function(base64, fileName) { //base64图片下载功能 let base64ToBlob = function(code) { let parts = code.split(';base64,'); let contentType = parts[0].split(':')[1]; let raw = window.atob(parts[1]); let rawLength = raw.length; let uInt8Array = new Uint8Array(rawLength); for (let i = 0; i < rawLength; ++i) { uInt8Array[i] = raw.charCodeAt(i); } return new Blob([uInt8Array], { type: contentType }); }; let aLink = document.createElement('a'); let blob = base64ToBlob(base64); //new Blob([content]); let evt = document.createEvent(HTMLEvents); evt.initEvent(click, true, true); //initEvent不加后两个参数在FF下会报错 事件类型，是否冒泡，是否阻止浏览器的默认行为 aLink.download = fileName; aLink.href = URL.createObjectURL(blob); aLink.click(); } 77、浏览器是否支持webP格式图片
const isSupportWebP = function() { //判断浏览器是否支持webP格式图片 return !![].map && document.createElement('canvas').toDataURL('image/webp').indexOf('data:image/webp') == 0; } 78、url参数转对象
const parseQueryString = function(url) { //url参数转对象 url = !url ? window.location.href : url; if (url.indexOf('?') === -1) { return {}; } let search = url[0] === '?' ? url.substr(1) : url.substring(url.lastIndexOf('?') + 1); if (search === '') { return {}; } search = search.split('&'); let query = {}; for (let i = 0; i < search.length; i++) { let pair = search[i].split('='); query[decodeURIComponent(pair[0])] = decodeURIComponent(pair[1] || ''); } return query; } 79、对象序列化【对象转url参数】
const stringfyQueryString = function(obj) { //对象序列化【对象转url参数】 if (!obj) return ''; let pairs = []; for (let key in obj) { let value = obj[key]; if (value instanceof Array) { for (let i = 0; i < value.length; ++i) { pairs.push(encodeURIComponent(key + '[' + i + ']') + '=' + encodeURIComponent(value[i])); } continue; } pairs.push(encodeURIComponent(key) + '=' + encodeURIComponent(obj[key])); } return pairs.join('&'); } 80、H5软键盘缩回、弹起回调
const h5Resize = function(downCb, upCb) { //当软件键盘弹起会改变当前 window.innerHeight，监听这个值变化 [downCb 当软键盘弹起后，缩回的回调,upCb 当软键盘弹起的回调] var clientHeight = window.innerHeight; downCb = typeof downCb === 'function' ? downCb : function() {} upCb = typeof upCb === 'function' ? upCb : function() {} window.addEventListener('resize', () => { var height = window.innerHeight; if (height === clientHeight) { downCb(); } if (height < clientHeight) { upCb(); } }); } 81、函数防抖
const debounce = function(func, wait, immediate) { //函数防抖[func 函数,wait 延迟执行毫秒数,immediate true 表立即执行,false 表非立即执行,立即执行是触发事件后函数会立即执行，然后n秒内不触发事件才能继续执行函数的效果] let timeout; return function() { let context = this; let args = arguments; if (timeout) clearTimeout(timeout); if (immediate) { var callNow = !timeout; timeout = setTimeout(() => { timeout = null; }, wait) if (callNow) func.apply(context, args) } else { timeout = setTimeout(function() { func.apply(context, args) }, wait); } } } 82、函数节流
const throttle = function(func, wait ,type) { //函数节流 [func 函数 wait 延迟执行毫秒数 type 1 表时间戳版，2 表定时器版] if(type===1){ let previous = 0; }else if(type===2){ let timeout; } return function() { let context = this; let args = arguments; if(type===1){ let now = Date.now(); if (now - previous > wait) { func.apply(context, args); previous = now; } }else if(type===2){ if (!timeout) { timeout = setTimeout(() => { timeout = null; func.apply(context, args) }, wait) } } } }