我的父元素中有方法，di 將其作為道具傳遞；像這樣：<NavBar retrieveList={this.retrieveList}/>在我的子組件中，我無法從另一個方法體調用此方法。handleCloseModal () {    window.$('#newHireModal').modal('hide');   /* this is working */    console.log(this.props.retrieveList);     /* it gives method body, just to be sure props is coming here */    this.props.retrieveList;   /*it gives "Expected an assignment or function call..." */    this.props.retrieveList();   /*it gives "this.props.retrieveList is not a function" */    return this.props.retrieveList;   /*it does nothing. no working, no error. */  }順便說一句，我有構造函數和綁定；constructor(props) {    super(props);    this.handleCloseModal = this.handleCloseModal.bind(this);retrieveList() {    StaffDataService.getAll()      .then(response => {        this.setState({          staffWithBasics: response.data,          filteredItems: response.data,        });      })      .catch(e => {        console.log(e);      });  }這段代碼有什么問題，我該如何運行這個父方法？