简单的判断：-------------------------------------------------

window.location.href = /Android|webOS|iPhone|iPod|BlackBerry/i.test(navigator.userAgent) ? "https://www.baidu.com/" : "http://news.baidu.com/";

问号前面是一个正则表达式，判断 属性 navigator.userAgent 的值中是否包含了以上的字符串。

如果有则跳转"https://www.baidu.com/"，如果没有"http://news.baidu.com/"

完整版的判断：-------------------------------------------

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 = ‘https://www.baidu.com/‘;

}else {

document.location.href = ‘https://www.baidu.com/‘;

}

//获取用户浏览器类型

public function getBrowser(){

$agent=$_SERVER["HTTP_USER_AGENT"];

if(strpos($agent,‘MSIE‘)!==false || strpos($agent,‘rv:11.0‘)) //ie11判断

return "ie";

else if(strpos($agent,‘Firefox‘)!==false)

return "firefox";

else if(strpos($agent,‘Chrome‘)!==false)

return "chrome";

else if(strpos($agent,‘Opera‘)!==false)

return ‘opera‘;

else if((strpos($agent,‘Chrome‘)==false)&&strpos($agent,‘Safari‘)!==false)

return ‘safari‘;

else

return ‘unknown‘;

}

原文：https://www.cnblogs.com/Smile-W/p/10782624.html