JS判断web网站访问端是PC电脑还是手机

 1 <script type="text/javascript">
 2 <!--
 3         //平台、设备和操作系统
 4         var system = {
 5             win: false,
 6             mac: false,
 7             xll: false,
 8             ipad:false
 9         };
10         //检测平台
11         var p = navigator.platform;
12         system.win = p.indexOf("Win") == 0;
13         system.mac = p.indexOf("Mac") == 0;
14         system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
15         system.ipad = (navigator.userAgent.match(/iPad/i) != null)?true:false;
16         //跳转语句，如果是手机访问就自动跳转到wap.baidu.com页面
17         if (system.win || system.mac || system.xll||system.ipad) {
18  
19         } else {
20  
21             window.location.href = "http://www.jdpatro.com/3g/";
22         }
23 -->
24 </script>