1 function isOpenMode(){ 2     //平台、设备和操作系统 3     var system = { 4         win: false, 5         mac: false, 6         xll: false, 7         ipad: false 8     };//检测平台
10     var p = navigator.platform;
11     system.win = p.indexOf("Win") == 0;
12     system.mac = p.indexOf("Mac") == 0;
13     system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
14     system.ipad = (navigator.userAgent.match(/iPad/i) != null) ? true : false;
15     //跳转语句，如果是手机访问就自动跳转到wap.baidu.com页面
16     if (system.win || system.mac || system.xll || system.ipad) {
17         var ua = navigator.userAgent.toLowerCase();
18         if(ua.match(/MicroMessenger/i)=="micromessenger") {
19             alert("在PC端微信上打开的");
20             return 2;
21         } else {
22             alert("在PC端非微信上打开的");
23             return 3;
24         }
25     } else {
26         var ua = navigator.userAgent.toLowerCase();
27         if(ua.match(/MicroMessenger/i)=="micromessenger") {
28             alert("在手机端微信上打开的");
29             return 1;
30         } else {
31             alert("在手机上非微信上打开的");
32             return 4;
33         }
34     }
35 }