用 javascript 脚本，网站判读来访者是手机还是电脑

<script>
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){//如果是电脑跳转到百度
        window.location.href="http://www.baidu.com/";
    }else{  //如果是手机,跳转到谷歌
        window.location.href="http://www.google.cn/";
    }
</script>