JavaScript判断系统语言

var lang= null;
function language(){
var language=null;
if (navigator.appName == 'Netscape'){
language = navigator.language;
}
else{
language = navigator.browserLanguage;
}
if (language.indexOf('en') > -1){
lang = "en"
// alert("yingwen");
}
else if (language.indexOf('zh') > -1){
lang = "zh"
// alert("zhongwen");
}
else{
lang = "en"
// alert("yingwen");
}
console.log(lang)
}

language()