jquery判断移动设备代码片段;pc、iphone、安卓

 $(document).ready(function () {
 /*  判断设备*/
     var browser={
         versions:function(){
             var u = navigator.userAgent, app = navigator.appVersion;
             return {
                 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.*/), //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 , //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
                 weixin: u.indexOf('MicroMessenger') > -1, //是否微信 （2015-01-22新增）
                 qq: u.match(/\sQQ/i) == " qq" //是否QQ

             };
         }(),
         language:(navigator.browserLanguage || navigator.language).toLowerCase()
     }
     if (window.orientation == 0 || window.orientation == 180 || window.orientation == 90 || window.orientation == -90) {
         if (window.orientation == 0 || window.orientation == 180) {
             $("body").attr("class", "portrait");
             orientation = 'portrait';
             if(browser.versions.android||browser.versions.iPhone||browser.versions.iPad){ window.location.href = "mobile.html";}else{

             }

             return false;
         }

     }
     $(window).bind( 'orientationchange', function(e){
         if (window.orientation == 0 || window.orientation == 180 || window.orientation == 90 || window.orientation == -90) {
             if (window.orientation == 0 || window.orientation == 180) {
                 $("body").attr("class", "portrait");
                 orientation = 'portrait';
                 if(browser.versions.android||browser.versions.iPhone||browser.versions.iPad){ window.location.href = "mobile.html";}else{

                 }

                 return false;
             }

   i      }
     });

 });