React 学习(二) 类组件的props

super

• super(props): Superclass will help you to keep the props:[^props]

  import React, { Component } from "react";
  export default class App extends Component {
    constructor(props) {
      super(props);
    }
  
    render() {
      return (
        <div>App</div>
      );
    }
  }
  

• But we use super() also can run

  import React, { Component } from "react";
  export default class App extends Component {
    constructor() {
      super();
    }
    render() {
      return (
        <div>App</div>
      );
    }
  }
  

• Subclass will auto execute the constructor function, we can not write it

  import React, { Component } from "react";
  export default class App extends Component {
    render() {
      return (
        <div>App</div>
      );
    }
  }