ant-design-pro @connect 应该如何理解?

关于ant-design-pro中使用的DVA的@connect的疑惑

import React, { Component } from 'react';
import { connect } from 'dva';
import { Link } from 'dva/router';
import { Checkbox, Alert, Icon } from 'antd';
import Login from 'components/Login';
import styles from './Login.less';

const { Tab, UserName, Password, Mobile, Captcha, Submit } = Login;

@connect(({ login, loading }) => ({
  login,
  submitting: loading.effects['login/login'],
}))im