使手机浏览器输入www网址自动跳转手机版页面

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://www.yuzhiguo.com/wap';}