Reactjs 在react中调用api时，我无法读取未定义的属性'then'

我得到TypeError：在react.js和redux中调用api时无法读取未定义的属性'then'

我的组件安装功能是-

componentDidMount() {
    window.scrollTo(0, 0);
    var requestedId = this.props.match.params.id;
    this.props.fetchCategoryJoblist(requestedId).then(() => {
      this.setState({ loading: false });
    });
  }

我在此行this.props.fetchCategoryJoblistrequestedId获得无法读取的then属性

我的组件安装函数-

componentDidMount() {
    window.scrollTo(0, 0);
    var requestedId = this.props.match.params.id;
    this.props.fetchCategoryJoblist(requestedId).then(() => {
      this.setState({ loading: false });
    });
  }

My action.js文件-

// code to get job listing based on category
export function setCategoryJoblist(categoryjoblist) {
  return {
    type: SET_CATEGORY_JOBLIST,
    categoryjoblist
  };
}

export function fetchCategoryJoblist(requestedId) {
  var apiUrl = `http://18.207.190.61:4000/getJobByCategory/${requestedId}`;
  return dispatch => {
    fetch(apiUrl)
      .then(res => res.json())
      .then(data => dispatch(setCategoryJoblist(data.Jobs)));
  };
}

---

那么如何在componentDidMount方法中使用then方法呢？

您的FetchCategory作业列表

export function fetchCategoryJoblist(requestedId) {
  var apiUrl = `http://18.207.190.61:4000/getJobByCategory/${requestedId}`;
  return dispatch => {
    // see here
    fetch(apiUrl)
      .then(res => res.json())
      .then(data => dispatch(setCategoryJoblist(data.Jobs)));
  };
}

也许问题就在这里

export function fetchCategoryJoblist(requestedId) {
  var apiUrl = `http://18.207.190.61:4000/getJobByCategory/${requestedId}`;
  return dispatch => {
    // you don't have return here, so your call to API is won't return a promise call CMIIW
    return fetch(apiUrl)
      .then(res => res.json())
      .then(data => dispatch(setCategoryJoblist(data.Jobs)));
  };
}

---

那么，我应该在这里做什么呢？尝试添加一个回访，看看我的猜测是否正确，或者在你的应用程序上是否可以调用。然后立即在componentDidMount上运行？你可以记录这一行吗？console.logthis.props.fetchCategoryJobListRequesteId