var browser = {             versions: function () {                 var u = navigator.userAgent, app = navigator.appVersion;                 return {//移动终端浏览器版本信息                     trident: u.indexOf('Trident') > -1, //IE内核                     presto: u.indexOf('Presto') > -1, //opera内核                     webKit: u.indexOf('AppleWebKit') > -1, //苹果、谷歌内核                     gecko: u.indexOf('Gecko') > -1 && u.indexOf('KHTML') == -1, //火狐内核                     mobile: !!u.match(/AppleWebKit.*Mobile.*/) || !!u.match(/AppleWebKit/), //是否为移动终端                     ios: !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/), //ios终端                     android: u.indexOf('Android') > -1 || u.indexOf('Linux') > -1, //android终端或者uc浏览器                     iPhone: u.indexOf('iPhone') > -1 || u.indexOf('Mac') > -1, //是否为iPhone或者QQHD浏览器                     iPad: u.indexOf('iPad') > -1, //是否iPad                     webApp: u.indexOf('Safari') == -1 //是否web应该程序，没有头部与底部                 };             } (),             language: (navigator.browserLanguage || navigator.language).toLowerCase()         } if (browser.versions.mobile == true || browser.versions.ios == true || browser.versions.android == true) {             window.location.href = target;         }