js 判断当前是手机还是电脑

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<script type="text/javascript">     var system ={};        var p = navigator.platform;        system.win = p.indexOf("Win") == 0;        system.mac = p.indexOf("Mac") == 0;        system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);        if(system.win||system.mac||system.xll){//如果是电脑跳转到        alert("电脑")        }else{  //如果是手机,跳转到        alert("手机")        } </script>