根据UA名字来判断设备类型：

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<script type = "text/javascript">
function browserRedirect()
{
    var sUserAgent = navigator.userAgent.toLowerCase();
    var bIsIpad = sUserAgent.match(/ipad/i) == "ipad";
    var bIsIphoneOs = sUserAgent.match(/iphone os/i) == "iphone os";
    var bIsMidp = sUserAgent.match(/midp/i) == "midp";
    var bIsUc7 = sUserAgent.match(/rv:1.2.3.4/i) == "rv:1.2.3.4";
    var bIsUc = sUserAgent.match(/ucweb/i) == "ucweb";
    var bIsAndroid = sUserAgent.match(/android/i) == "android";
    var bIsCE = sUserAgent.match(/windows ce/i) == "windows ce";
    var bIsWM = sUserAgent.match(/windows mobile/i) == "windows mobile";
    if (bIsIpad || bIsIphoneOs || bIsMidp || bIsUc7 || bIsUc || bIsAndroid || bIsCE || bIsWM)
    {
        var choice = confirm("you appears to be in mobile mode, will rediect to baidu");
        var choice1;
        window.location = choice ? "https://www.baidu.com/" : (choice1 = confirm("force to redirect to zhihu could result in bad viewer experience") ? "https://www.zhihu.com" : "https://www.baidu.com/");
    }
    else
    {
        var choice = confirm("you appears to be in pc mode, will rediect to zhihu");
        var choice1;
        window.location = choice ? "https://www.zhihu.com/" : (choice1 = confirm("force to redirect to baidu could result in bad viewer experience") ? "https://www.baidu.com/" : "https://www.zhihu.com");
    }
}

browserRedirect();
</script>