if(/AppleWebKit.*Mobile/i.test(navigator.userAgent) || (/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/.test(navigator.userAgent))){ 
    if(window.location.href.indexOf("?mobile")<0){ 
        try{ 
            if(/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)){
                
 
//手機 
                window.location.href="http://www.mobile.com"; 
            }else if(/iPad/i.test(navigator.userAgent)){ 
                //ipad
                window.location.href="http://ipad.com" 
            }else{ 
                //電腦
                window.location.href="http://pc.com" 
            } 
        }
 
catch(e){} 
    } 
} 

通過js中的useragrent來判斷設備是pc端還是移動端，跳轉不同的地址