「React入門」 コンポーネントのコンストラクタを実装するサンプル

書式
constructor(props) {
super(props);
this.state = {date: new Date()};
}
使用例

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</title>
<script src="/react/16.4.0/umd/react.development.js"></script>
<script src="/react-dom/16.4.0/umd/react-dom.development.js"></script>
<script src="/babel-standalone/6.26.0/babel.min.js"></script>
</head>
<body>

<div id="cft"></div>
<script type="text/babel">
class Clock extends React.Component {
  constructor(props) {
    super(props);
    this.state = {date: new Date()};
  }

  render() {
    return (
      <div>
        <h1>Hello, world!study skill in arkgame</h1>
        <h2>日付 {this.state.date.toLocaleTimeString()}.</h2>
      </div>
    );
  }
}

ReactDOM.render(
  <Clock />,
  document.getElementById('cft')
);
</script>

</body>
</html>

 

React

Posted by arkgame