讲解一些JS常见方法封装

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1、判断是否是微信浏览器

function isWechat() {     var ua = navigator.userAgent.toLowerCase();     if (ua.match(/MicroMessenger/i) == 'micromessenger') {         return true;     } else {         return false;     } }

2、判断是否是PC/WAP端

function isPC() {     var userAgentInfo = navigator.userAgent;     var Agents = ['Android', 'iPhone', 'SymbianOS', 'Windows Phone', 'iPad', 'iPod'];     var flag = true;     for (var v = 0; v < Agents.length; v++) {         if (userAgentInfo.indexOf(Agents[v]) > 0) {             flag = false;             break;         }     }     return flag; }

3、获取URL参数

function getUrlParam(name, url) {     if (!url) url = location.href;     if (url.indexOf('?') == -1) return '';     try {         var re = new RegExp("" + name + "=([^&?]*)", "ig");         return ((url.match(re)) ? (decodeURIComponent(url.match(re)[0].substr(name.length + 1))) : '');     } catch (_e) {         return '';     } }

4、获取cookie

function getCookie(name, defaultVal = null) {     var arr,     reg = new RegExp('(^| )' + name + '=([^;]*)(;|$)');     if (arr = document.cookie.match(reg)) {         return unescape(arr[2]);     } else {         return defaultVal;     } }

5、设置cookie

function setCookie(name, value, seconds) {     var expires = new Date();     expires.setTime(expires.getTime() + parseInt(seconds) * 1000);     var domain = document.domain;     var domainArr = domain.split('.');     if (domainArr.length >= 3) {         domainArr.shift();         domain = domainArr.join('.');     }         document.cookie = escape(name) + '=' + escape(value) + (seconds ? ('; expires=' + expires.toGMTString()) : "") + '; path=/; domain=.' + domain + ';'; }

6、删除cookie

// this指上面的方法 function delCookie(name) {     this.setCookie(name, '', -1); }

7、保存网页到桌面

function toDesktop(sUrl,sName){     try {         var WshShell = new ActiveXObject("WScript.Shell");         var oUrlLink = WshShell.CreateShortcut(WshShell.SpecialFolders("Desktop")+ "\" + sName + ".url");         oUrlLink.TargetPath = sUrl;         oUrlLink.Save();     }catch(e){         alert("当前IE安全级别不允许操作！");     } }

8、添加网页到收藏

function AddFavorite(title, url){     try {         window.external.addFavorite(url, title);     }catch (e) {         try {             window.sidebar.addPanel(title, url, "");         }catch (e) {             alert("抱歉，您所使用的浏览器无法完成此操作。nn加入收藏失败，请使用Ctrl+D进行添加");         }     } }

9、判断是否为空

function isEmpty(val){     if(typeof val == "undefined" || val == null || val == ""){         return true;     } else {         return false;     } }

10、值是否在数组内

function inArray(search, array) {     for (var i in array) {         if (array[i] == search) {             return true;         }     }     return false; }

11、数组去重

function arrayUnique(arr) {     return [...new Set(arr)]; }

12、设置Localstorage

function setLocalstorage(key, value) {     if(!window.Storage) {         console.error("该浏览器不支持Localstorage属性!!");         return false;     } else {         localStorage.setItem(key, value);     } }

13、获取Localstorage

function getLocalstorage(key) {     var value = localStorage.getItem(key);     if (value) {         try {             var value_json = JSON.parse(value);             if (typeof value_json === 'object') {                 return value_json;             } else if (typeof value_json === 'number') {                 return value_json;             }         } catch(e) {             return value;         }     } else {         return false;     } }

14、移除单个Localstorage

function removeLocalstorage(key) {     localStorage.removeItem(key); }

15、清除整个Localstorage

function clearLocalstorage() {     localStorage.clear(); }

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