我一直在使用Hamid的答案一段时间，但在语言数组像["en"， "en- gb "， "en- us "， "fr- fr"， "fr"， "en- za "]的情况下，它将返回"en"，当"en- gb "将是一个更好的匹配。

我的更新(下面)将返回第一个长格式的代码，例如。"en-GB"，否则将返回第一个短代码，例如。"en"，否则返回null。

function getFirstBrowserLanguage() { var nav = window.navigator, browserLanguagePropertyKeys = ['language', 'browserLanguage', 'systemLanguage', 'userLanguage'], i, language, len, shortLanguage = null; // support for HTML 5.1 "navigator.languages" if (Array.isArray(nav.languages)) { for (i = 0; i < nav.languages.length; i++) { language = nav.languages[i]; len = language.length; if (!shortLanguage && len) { shortLanguage = language; } if (language && len>2) { return language; } } } // support for other well known properties in browsers for (i = 0; i < browserLanguagePropertyKeys.length; i++) { language = nav[browserLanguagePropertyKeys[i]]; //skip this loop iteration if property is null/undefined. IE11 fix. if (language == null) { continue; } len = language.length; if (!shortLanguage && len) { shortLanguage = language; } if (language && len > 2) { return language; } } return shortLanguage; } console.log(getFirstBrowserLanguage());

更新:当某些属性未定义时，IE11出现错误。增加了跳过这些属性的检查。

对于这个问题，DanSingerman有一个很好的解决方案。

该语言的唯一可靠来源是http请求头。 因此，您需要一个服务器端脚本来回复请求报头，或者至少是Accept-Language字段。

这是一个非常简单的Node.js服务器，它应该与DanSingermans的jQuery插件兼容。

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end(JSON.stringify(req.headers));
}).listen(80,'0.0.0.0');

Javascript方法:

var language = window.navigator.userLanguage || window.navigator.language;//returns value like 'en-us'

如果你正在使用jQuery。I18n插件，你可以使用:

jQuery.i18n.browserLang();//returns value like '"en-US"'

我有一个黑客，我认为使用很少的代码，是相当可靠的。

把网站的文件放到子目录中。SSL到您的服务器中，并创建到存储文件的子目录的符号链接，该子目录指示您的语言。

就像这样:

ln -s /var/www/yourhtml /var/www/en
ln -s /var/www/yourhtml /var/www/sp
ln -s /var/www/yourhtml /var/www/it

使用您的web服务器读取HTTP_ACCEPT_LANGUAGE并根据它提供的语言值重定向到这些“不同的子目录”。

现在您可以使用Javascript的window.location.href来获取url，并在条件中使用它来可靠地识别首选语言。

url_string = window.location.href;
if (url_string = "http://yoursite.com/it/index.html") {
    document.getElementById("page-wrapper").className = "italian";
}

I can't find a single reference that state that it's possible without involving the serverside.

MSDN上:

navigator.browserLanguage navigator.systemLanguage navigator.userLanguage

从browserLanguage:

In Microsoft Internet Explorer 4.0 and earlier, the browserLanguage property reflects the language of the installed browser's user interface. For example, if you install a Japanese version of Windows Internet Explorer on an English operating system, browserLanguage would be ja. In Internet Explorer 5 and later, however, the browserLanguage property reflects the language of the operating system regardless of the installed language version of Internet Explorer. However, if Microsoft Windows 2000 MultiLanguage version is installed, the browserLanguage property indicates the language set in the operating system's current menus and dialogs, as found in the Regional Options of the Control Panel. For example, if you install a Japanese version of Internet Explorer 5 on an English (United Kingdom) operating system, browserLanguage would be en-gb. If you install Windows 2000 MultiLanguage version and set the language of the menus and dialogs to French, browserLanguage would be fr, even though you have a Japanese version of Internet Explorer. Note This property does not indicate the language or languages set by the user in Language Preferences, located in the Internet Options dialog box.

此外，它看起来像是browserLanguage被弃用了，因为IE8没有列出它

如果您不想依赖外部服务器，并且您有自己的服务器，您可以使用一个简单的PHP脚本来实现与@DanSingerman answer相同的行为。

languageDetector.php:

<?php
$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
echo json_encode($lang);
?>

只需从jQuery脚本中更改这几行:

url: "languageDetector.php",
dataType: 'json',
success: function(language) {
    nowDoSomethingWithIt(language);
}