ReactRedux-在已连接的组件中使用mapDispatchToProps时如何在componentDidMount上调度动作

我将您的代码修改为我认为可行的代码。我也发表了评论。

class App extends Component {

  state = {
    posts: []
  }

  componentDidMount() {
    // no need to use dispatch again. Your action creators are already bound by 
    // mapDispatchToProps.  Notice also that they come from props
    const { selectedCategory, fetchCategoriesIfNeeded, fetchPostsIfNeeded} = this.props;
    fetchCategoriesIfNeeded(selectedCategory);
    fetchPostsIfNeeded(selectedCategory);
  }

  //... the same
}

function mapStateToProps ( state ) {
  //... the same
}

function mapDispatchToProps (dispatch) {
  // when arguments match, you can pass configuration object, which will 
  // wrap your actions creators with dispatch automatically.
  return {
    orderPost,
    fetchCategoriesIfNeeded,
    fetchPostsIfNeeded,
  }
}