$(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'

            });

        }

    }

});