第一种方法：
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}
}
if (is_mobile()) {document.location.href= 'http://3g.onestopweb.cn/?www.onestopweb.cn';}
第二种方法：
if (/AppleWebKit.*Mobile/i.test(navigator.userAgent) || (/MIDP|SymbianOS|NOKIA|SAMSUNG|LG|NEC|TCL|Alcatel|BIRD|DBTEL|Dopod|PHILIPS|HAIER|LENOVO|MOT-|Nokia|SonyEricsson|SIE-|Amoi|ZTE/.test(navigator.userAgent))) {
if (window.location.href.indexOf("?mobile") < 0) {
try {
if (/Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent)) {
window.location.href = "http://3g.onestopweb.cn/?3G";
}
} catch (e) {}
}
}
第三种方法，引用 百度提供的方法：
<script src="http://siteapp.baidu.com/static/webappservice/uaredirect.js" type="text/javascript"></script>
<script type="text/javascript">uaredirect("http://3g.onestopweb.cn/");</script>
