js屏蔽pc端访问

<script type="text/javascript"> 
//平台、设备和操作系统 
var system ={ 
    win : false, 
    mac : false, 
    xll : 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);
if(system.win||system.mac||system.xll){   
    window.location.href="pc端访问的链接";
}else{ 
}

</script>