判断pc浏览器和手机浏览器方法

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        //平台、设备和操作系统
        var system = {
            win: false,
            mac: false,
            xll: false,
            ipad:false
        };
        //检测平台
        var p = navigator.platform;
        system.win = p.indexOf("Win") == 0;
        system.mac = p.indexOf("Mac") == 0;
        system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
        system.ipad = (navigator.userAgent.match(/iPad/i) != null)?true:false;

        if (system.win || system.mac || system.xll||system.ipad) {

        } else {
           var weixin =new is_weixn;
        }
        function is_weixn(){
            var ua = navigator.userAgent.toLowerCase();
            if(ua.match(/MicroMessenger/i)=="micromessenger") {
                return true;
            } else {
                jQuery(document).ready(function($){
                 login();
                })
            }
       }
        function login(){
           var obj = new WxLogin({
               id: "code",
               appid: appid,
               scope: "snsapi_login",
               redirect_uri: "http%3a%2f%2fwww.caiex.com%2fCAIEX-GAME%2floginController%2floginFallsGame.shtml%3fpageName%3d55",
               state: randomString(6),
               style: "black",
               href: ""
           });
           $('.theme-popover-mask').fadeIn(100);
           $('.theme-popover').slideDown(200);
       }