js判斷是手機訪問還是電腦訪問,進行自動跳轉

<script type="text/javascript">
    <!--
    //平臺、設備和操作系統
    var system ={
        win : false,
        mac : false,
        xll : false
    };
    //檢測平臺
    var p = navigator.platform;
    alert(p);
    system.win = p.indexOf("Win") == 0;
    system.mac = p.indexOf("Mac") == 0;
    system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
    //跳轉語句
    if(system.win||system.mac||system.xll){//轉向後臺登陸頁面
        window.location.href="login.jsp";
    }else{
        window.location.href="wapLojin.jsp";
    }
    -->
</script>