Javascript 这就是在React中将父组件的方法传递给子组件的方式吗？

在我正在编写的一本书的一节中，我解释了子组件如何访问父方法

从子级到父级的通信方式是将回调从父级传递给子级，子级可以调用回调来完成特定任务。在本例中，您将createIssue作为回调属性从IssueTable传递给IssueAdd。从子级，您只需在处理程序中调用传入函数来创建新问题

作者提到了IssueAddsibling的IssueAble兄弟姐妹，他可能是指IssueAddchild的IssueAlist父母，对吧

我认为只要检查IssueList返回的JSX

我们可以看到IssueTable是IssueAdd的兄弟，不是吗

简而言之，要利用父函数中声明的函数，我们需要做的就是

const contentNode = document.getElementById('contents');


class ChildComponent extends React.Component {
  constructor(props) {
    super(props);
        this.props.someFunc; //So naming this prop someFunc will just help us identify this prop should get the function from the parent?
  }
}

class Parent extends React.component{
  constructor(props) {
    super(props);
        this.someFunc = this.someFunc.bind(this);
  }

  someFunc(){
   ....
  }

   render() {
    return (
      <div>
        <ChildComponent someFunc={this.someFunc} /> // Parent's someFunc gets passed as a value to the ChildComponent's prop which is someFunc?
      </div>
    );
  }
}

ReactDOM.render(<Parent />, contentNode);

是IssueTable和IssueAdd实际上是您发布的代码片段中的同级

class ChildComponent extends React.Component {
  constructor(props) {
    super(props);
        this.props.someFunc; //So naming this prop someFunc will just help us identify this prop should get the function from the parent?
  }
}

在上面的代码段中，this.props.someFunc将不起任何作用，它只返回从ParentComponent发送的函数，但不会发生任何事情

如果您计划通过ChildComponent中的操作修改或更改父级的状态，那么下面的代码片段可能更有意义

class ChildComponent extends React.Component {
  constructor(props) {
     super(props);         
   }

  handleOnClick = (event) => {
     // The name is someFunc because that is what you sent as props from the 
     // ParentComponent <ChildComponent someFunc={this.someFunc} />

     // If it had been <ChildComponent callbackToParent={this.someFunc} /> 
     // then you should access the function as this.props.callbackToParent 
     // and invoke as this.props.callbackToParent()

     this.props.someFunc();  
  }

  render() {
    return (
      <div onClick={this.handleOnClick}>
        Click to trigger callback sent by parent
      </div>
    ) 
  }
}

---

组件的布局方式，您发布的描述是错误的，您是正确的：createIssue回调从IssueList传递到IssueId。IssueList的子项是：IssueFilter、IssueTable和IssueId。

class ChildComponent extends React.Component {
  constructor(props) {
     super(props);         
   }

  handleOnClick = (event) => {
     // The name is someFunc because that is what you sent as props from the 
     // ParentComponent <ChildComponent someFunc={this.someFunc} />

     // If it had been <ChildComponent callbackToParent={this.someFunc} /> 
     // then you should access the function as this.props.callbackToParent 
     // and invoke as this.props.callbackToParent()

     this.props.someFunc();  
  }

  render() {
    return (
      <div onClick={this.handleOnClick}>
        Click to trigger callback sent by parent
      </div>
    ) 
  }
}