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>