js判断是手机访问还是电脑访问

<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;

alert(p);

system.win = p.indexOf("Win") == 0;

system.mac = p.indexOf("Mac") == 0;

system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);

//跳转语句

if(system.win||system.mac||system.xll){//转向后台登陆页面

window.location.href="login.jsp";

}else{

window.location.href="wapLojin.jsp";

}

-->

</script>