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      }
    });




});