code: function locate(arg) {
    var newLocale = undefined,
        prop = undefined;
    if (typeof arg === 'string') {
      newLocale = arg === 'zh-cn' ? LOCALE_ZH_CN : LOCALE_EN;
    } else {
      newLocale = arg;
    }
    if (!_curentLocale) {
      _curentLocale = {};
    }
    for (prop in newLocale) {
      if (newLocale.hasOwnProperty(prop) && typeof newLocale[prop] === 'string') {
        _curentLocale[prop] = newLocale[prop];
      }
    }
  }
docs: 修改本地化语言
  @param  {string|Object}   string: 预设语言 `zh-cn` 或 `en`；Object: 自定义 locate 对象