React 组件的生命周期

  • Z时代
  • 2024-01-10
  • 分类：综合

react

生命周期

组件的生命周期可分成三个状态：

Mounting：已插入真实 DOM

Updating：正在被重新渲染

Unmounting：已移出真实 DOM

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>React 实例</title>
<script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script>
<script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>
<div ></div>
<script type="text/babel">
class Button extends React.Component {
  constructor(props) {
      super(props);
      this.state = {data: 0};
      this.setNewNumber = this.setNewNumber.bind(this);
  }
  setNewNumber() {
    this.setState({data: this.state.data + 1})
  }
  render() {
      return (
         <div>
            <button onClick = {this.setNewNumber}>INCREMENT</button>
            <Content myNumber = {this.state.data}></Content>
         </div>
      );
    }
}
class Content extends React.Component {
  componentWillMount() {
      console.log('Component WILL MOUNT!')
  }
  componentDidMount() {
       console.log('Component DID MOUNT!')
  }
  componentWillReceiveProps(newProps) {
        console.log('Component WILL RECEIVE PROPS!')
  }
  shouldComponentUpdate(newProps, newState) {
        return true;
  }
  componentWillUpdate(nextProps, nextState) {
        console.log('Component WILL UPDATE!');
  }
  componentDidUpdate(prevProps, prevState) {
        console.log('Component DID UPDATE!')
  }
  componentWillUnmount() {
         console.log('Component WILL UNMOUNT!')
  }
    render() {
      return (
        <div>
          <h3>{this.props.myNumber}</h3>
        </div>
      );
    }
}
ReactDOM.render(
   <div>
      <Button />
   </div>,
  document.getElementById('example')
);
</script>
</body>
</html>

以上是 React 组件的生命周期 的全部内容， 来源链接： utcz.com/z/382662.html

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