$(function(){    var u = navigator.userAgent;    var ua = navigator.userAgent.toLowerCase();    var isAndroid = u.indexOf(‘Android‘) > -1 || u.indexOf(‘Adr‘) > -1; //android终端    var isiOS = !!u.match(/\(i[^;]+;( U;)? CPU.+Mac OS X/); //ios终端    if(ua.match(/MicroMessenger/i)=="micromessenger") {   //微信内置浏览器+应用宝链接        $(".download a").bind(‘touchstart‘, function (event) {            window.location.href=‘http://a.app.qq.com/o/simple.jsp?pkgname=应用名 ‘        });    }else{        if(isiOS){            $(".download a").bind(‘touchstart‘, function (event) {                window.location.href=‘https://itunes.apple.com/cn/app/应用名‘                             });        }else if(isAndroid){            $(".download a").bind(‘touchstart‘, function (event) {                window.location.href=‘http://a.app.qq.com/o/simple.jsp?pkgname=应用名‘                             });        }else{  //PC 端            $(".download a").click(function(){                window.location.href=‘应用链接‘            });        }         }     });