javascript 第26集React Scrimba

Posted 2021-05-03

import React from "react";

// https://scrimba.com/p/p4Mrt9/cQnMDHD

class App extends React.Component {
  //ctor initializes the component's state
  constructor() {
    //call the super class constructor to initialize the base class part
    super();
    //initialize the derived class part
    this.state = {
      answer: "Yes"
    };
  }

  render() {
    return (
      <div>
        <h1>Is state important to know? {this.state.answer}</h1>
        //pass the state to a child component
        <ChildComponent answer={this.state.answer} />
      </div>
    );
  }
}

export default App;