Is there any way to check if the browser locales are in the application locales list? about i18n-node-2 HOT 3 CLOSED

var lang = req.headers["accept-language"].split(',');
var locales = ['en', 'zh-CN'];

for (var i = 0; i < lang.length; i++) {
    for (var j=0; j < locales.length; j++) {

        if ( lang[i].split(';')[0] == locales[j] ) {
            console.log(locales[j]);
        }
    }
}