实例一、比较简单粗暴缺少点类型判断
<script type="text/javascript"> var sUserAgent = navigator.userAgent.toLowerCase(); var bIsIpad = sUserAgent.match(/ipad/i) == "ipad"; var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os"; var bIsMidp = sUserAgent.match(/midp/i) == "midp"; var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4"; var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb"; var bIsAndroid = sUserAgent.match(/android/i) == "android"; var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce"; var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile"; if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM ){ window.location.href="3g.php"; } </script>实例二、代码工整，很多的函数都基于这个增加的功能
<script>var pc_style = ""var browser = {versions: function () {var u = navigator.userAgent, app = navigator.appVersion;return {trident: u.indexOf('Trident') > -1,presto: u.indexOf('Presto') > -1,webKit: u.indexOf('AppleWebKit') > -1,gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1,mobile: !!u.match(/AppleWebKit.*Mobile.*/) || !!u.match(/AppleWebKit/) && u.indexOf('QIHU') && u.indexOf('QIHU') > -1 && u.indexOf('Chrome') < 0,ios: !!u.match(//(i[^;]+;( U;)? CPU.+Mac OS X/),android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1,iPhone: u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1,iPad: u.indexOf('iPad') > -1,webApp: u.indexOf('Safari') == -1,ua: u};}(),language: (navigator.browserLanguage || navigator.language).toLowerCase()}if (browser.versions.mobile && !browser.versions.iPad) {this.location = "此处输入跳转微站首页地址";}</script>实例三、增加了一些功能
<!--智能手机判断开始--><!-- <script type = "text/javascript" language = "javascript" >Function.prototype.bind = function (bindObj, args) {var _self = this;return function () {return _self.apply(bindObj, [].concat(args))}};function $(id) {return "string" == typeof id ? document.getElementById(id) : id;};var browser = {versions : function () {var u = navigator.userAgent,app = navigator.appVersion;return {trident : u.indexOf('Trident') > -1,presto : u.indexOf('Presto') > -1,webKit : u.indexOf('AppleWebKit') > -1,gecko : u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1,mobile : !!u.match(/AppleWebKit.*Mobile.*/) || !!u.match(/AppleWebKit/),ios : !!u.match(//(i[^;]+;( U;)? CPU.+Mac OS X/),android : u.indexOf('Android') > -1 || u.indexOf('Linux') > -1,iPhone : u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1,iPad : u.indexOf('iPad') > -1,webApp : u.indexOf('Safari') == -1,QQbrw : u.indexOf('MQQBrowser') > -1,ucLowEnd : u.indexOf('UCWEB7.') > -1,ucSpecial : u.indexOf('rv:1.2.3.4') > -1,ucweb : function () {try {return parseFloat(u.match(/ucweb/d+/./d+/gi).toString().match(//d+/./d+/).toString()) >= 8.2} catch (e) {if (u.indexOf('UC') > -1) {return true;} else {return false;}}}(),Symbian : u.indexOf('Symbian') > -1,ucSB : u.indexOf('Firefox/1.') > -1};}()}var _gaq = _gaq || [];(function (win, browser, undefined) {var rf = document.referrer;if (rf === "" || rf.toLocaleLowerCase().indexOf(".xiu.com") === -1) {var defaultJumpDomain = "";if (defaultJumpDomain == "www") {return;}if (defaultJumpDomain == "m") {window.location.href = "http://wap.xiu.com/?from=pc";return;}if (screen == undefined || screen.width < 810) {if (browser.versions.iPad == true) {return;}if (browser.versions.webKit == true || browser.versions.mobile == true || browser.versions.ios == true || browser.versions.iPhone == true || browser.versions.ucweb == true || browser.versions.ucSpecial == true) {win.location.href = "http://wap.xiu.com/?from=pc";return;}if (browser.versions.Symbian) {win.location.href = "http://wap.xiu.com/";}}}})(window, browser); </script>--><!--智能手机判断结束-->实例四、简洁武林网推荐使用，如果您有更好的代码可以分享
<script type="text/javascript">var browser = {versions : function () {var u = navigator.userAgent,app = navigator.appVersion;return {trident : u.indexOf('Trident') > -1,presto : u.indexOf('Presto') > -1,webKit : u.indexOf('AppleWebKit') > -1,gecko : u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1,mobile : !!u.match(/AppleWebKit.*Mobile.*/) || !!u.match(/AppleWebKit/),ios : !!u.match(//(i[^;]+;( U;)? CPU.+Mac OS X/),android : u.indexOf('Android') > -1 || u.indexOf('Linux') > -1,iPhone : u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1,iPad : u.indexOf('iPad') > -1,webApp : u.indexOf('Safari') == -1,QQbrw : u.indexOf('MQQBrowser') > -1,weiXin : u.indexOf('MicroMessenger') > -1,ucLowEnd : u.indexOf('UCWEB7.') > -1,ucSpecial : u.indexOf('rv:1.2.3.4') > -1,ucweb : function () {try {return parseFloat(u.match(/ucweb/d+/./d+/gi).toString().match(//d+/./d+/).toString()) >= 8.2} catch (e) {if (u.indexOf('UC') > -1) {return true;} else {return false;}}}(),Symbian : u.indexOf('Symbian') > -1,ucSB : u.indexOf('Firefox/1.') > -1};}(),liulanqi : navigator.userAgent}if (browser.versions.QQbrw){document.write("qq浏览器");}else{document.write("其它浏览器"+browser.liulanqi);}</script>