React事件2.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="./js/react.js"></script>
  <script src="./js/react-dom.js"></script>
  <script src="./js/browser.js"></script>
  <script type="text/babel">
    class Comp extends React.Component{
      constructor(...args){
        super(...args);
        this.state = {value: ''};
      }
      fn (ev){
        this.setState({
          value: ev.target.value
        })
      }
      render(){
        return <div>
          <input type="text" onChange={this.fn.bind(this)}/>
          <span>{this.state.value}</span>
        </div>
      }
    }
    window.onload = function (){
      var oDiv = document.getElementById("div1");
      ReactDOM.render(
        <Comp/>,
        oDiv
      )
    }
  </script>
</head>
<body>
  <div id="div1">

  </div>
</body>
</html>