网站既包含PC端页面，又包括手机端页面时，打开手机端自动跳转手机页面，js代码如下

<script type="text/javascript">
        var mobileAgent = new Array("iphone", "ipod", "ipad", "android", "mobile", "blackberry", "webos", "incognito", "webmate",
　　　　　　 "bada", "nokia", "lg", "ucweb", "skyfire");
        var browser = navigator.userAgent.toLowerCase(); 
        var isMobile = false; 
        for (var i=0; i<mobileAgent.length; i++) {
            if (browser.indexOf(mobileAgent[i])!=-1) { 
                isMobile = true; 
                location.href = '#';//要跳转的网址
                break; 
            } 
        } 
</script>

第二种

<script src="http://siteapp.baidu.com/static/webappservice/uaredirect.js" type="text/javascript"></script>
<script type="text/javascript">uaredirect("你的手机版网址");</script>

第三种

<script language="javascript">
    function is_mobile() {
        var regex_match = /(nokia|iphone|android|motorola|^mot-|softbank|foma|docomo|kddi|up.browser|up.link|htc|dopod|blazer|netfront|helio|hosin|huawei|novarra|CoolPad|webos|techfaith|palmsource|blackberry|alcatel|amoi|ktouch|nexian|samsung|^sam-|s[cg]h|^lge|ericsson|philips|sagem|wellcom|bunjalloo|maui|symbian|smartphone|midp|wap|phone|windows ce|iemobile|^spice|^bird|^zte-|longcos|pantech|gionee|^sie-|portalmmm|jigs browser|hiptop|^benq|haier|^lct|operas*mobi|opera*mini|320x320|240x320|176x220)/i;
        var u = navigator.userAgent;
        if (null == u) {
            return true;
        }
        var result = regex_match.exec(u);
        if (null == result) {
            return false
        } else {
            return true
        }
    }

    function QueryString(item) {
        var sValue = location.search.match(new RegExp("[\?\&]" + item + "=([^\&]*)(\&?)", "i"))
        return sValue ? sValue[1] : sValue
    }
    if (QueryString("ID") != "t" && is_mobile()) {
        document.location.href = '#';//要跳转的网址
    }
</script>