//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;  
         //跳转语句,如果是手机访问就自动跳转到wap.baidu.com页面   
         if (system.win || system.mac || system.xll || system.ipad) {  
             alert("在PC端上打开的");
         } else {  
             var ua = navigator.userAgent.toLowerCase();    
             if(ua.match(/MicroMessenger/i)=="micromessenger") {    
                 alert("在手机端微信上打开的");  
             } else {    
                 alert("在手机上非微信上打开的");  
             }    
         }  

 

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