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表单双向绑定

React 表单双向绑定

import React, { Component } from 'react';
class App extends Component {  
  constructor(props) {
    super(props);
    this.state = {num:1}
  }
  changeNum(e){
    this.setState({num:e.target.value})
  }
  render() {     
    return (
      <div classname="App">
      <input type="text" value="{this.state.num}" onchange="{this.changeNum.bind(this)}/">
      <h1>{this.state.num}</h1>
      </div>
    );
  }
}
 
export default App;