var hellos = {
    ESP: 'Hola a todos!',
    ENG: 'Hello everybody!'
};

var myLang = 'ESP';

console.log(hellos[myLang]);

我不喜欢将所有内容放在全局范围内，然后通过字符串访问窗口属性；所以这是另一种方法.

I don't like putting everything in global scope, and then string accessing window properties; so here is another way to do it.