数组为Javascript Const?

时间:2018-01-09 17:44:21

标签: javascript reactjs ecmascript-6 redux

尝试了解在商店中使用自定义中间件的React-Redux代码库。自定义中间件使用API​​客户端功能,该功能管理对传递给它的操作的API调用。

在中间件中,有一个我无法理解的变量声明。它使用数组作为变量。

const [REQUEST, SUCCESS, FAILURE] = types; 
// types: [REGISTER, REGISTER_SUCCESS, REGISTER_FAIL],

reducer看起来像这样:

case LOAD:
  return {
    ...state,
    loading: true
  };
case LOAD_SUCCESS:
  saveAuthCookie( action.result );
  return {
    ...state,
    loading: false,
    loaded: true,
    user: cookie.load( userCookieName ) ? cookie.load( userCookieName ) : action.result
  };
case LOAD_FAIL:
  console.log(`auth LOAD_FAIL with error ${util.inspect(action.error)}`);
  return {
    ...state,
    loading: false,
    loaded: false,
    error: action.error
  };

正在调用的reducer导出的函数如下所示:

export function load() {
 return {
   types: [LOAD, LOAD_SUCCESS, LOAD_FAIL],
   promise: (client) => client.get( '/auth/loadAuth' )
 };
}

0 个答案:

没有答案