11. react 组合与继承

function Dialog(props) {
  return (
    <div>
      {props.children} // 插槽，用来渲染组件中嵌套的所有 JSX
    </div>
  )
}

function WelcomeDialog(props) {
　// Dialog 组件中嵌套的子组件都会被分配给 props.children
  return (
    <Dialog>
      <div> hello react </div>
      <div> hello react..... </div>
    </Dialog>
  )
}

ReactDOM.render(
  <WelcomeDialog />,
  document.getElementById(‘root‘)
)

function SplitPane (props) {
  return (
    <div>
      <div>{props.left}</div>
      <hr />
      <div>{props.right}</div>
    </div>
  )
}
function Left () {
  return (
    <div>
      left
    </div>
  )
}
function Right(props) {
  return (
    <div>
      right
    </div>
  )
}
function Contianer (props) {
　// 属性接收组件
  return (
    <SplitPane left={ <Right/>} right={ <Left /> }>

    </SplitPane>
  )
}

ReactDOM.render(
  <Contianer />,
  document.getElementById(‘root‘)
)

function Dialog(props) {
  return (
    <FancyBorder color="blue">
      <h1 className="Dialog-title">
        {props.title}
      </h1>
      <p className="Dialog-message">
        {props.message}
      </p>
      {props.children}
    </FancyBorder>
  );
}

class SignUpDialog extends React.Component {
  constructor(props) {
    super(props);
    this.handleChange = this.handleChange.bind(this);
    this.handleSignUp = this.handleSignUp.bind(this);
    this.state = {login: ‘‘};
  }

  render() {
    return (
      <Dialog title="Mars Exploration Program"
              message="How should we refer to you?">
        <input value={this.state.login}
               onChange={this.handleChange} />
        <button onClick={this.handleSignUp}>
          Sign Me Up!
        </button>
      </Dialog>
    );
  }

  handleChange(e) {
    this.setState({login: e.target.value});
  }

  handleSignUp() {
    alert(`Welcome aboard, ${this.state.login}!`);
  }
}