源代碼
點擊運行
<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>React 實例</title> <script src="https://cdn.staticfile.org/react/16.4.0/umd/react.development.js"></script> <script src="https://cdn.staticfile.org/react-dom/16.4.0/umd/react-dom.development.js"></script> <script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script> </head> <body> <div id="example"></div> <script type="text/babel"> class Counter extends React.Component{ constructor(props) { super(props); this.state = {clickCount: 0}; this.handleClick = this.handleClick.bind(this); } handleClick() { this.setState(function(state) { return {clickCount: state.clickCount + 1}; }); } render () { return (<h2 onClick={this.handleClick}>點我!點擊次數為: {this.state.clickCount}</h2>); } } ReactDOM.render( <Counter />, document.getElementById('example') ); </script> </body> </html>
運行結果