lovecoding
/
W250511


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./babel.min.js"></script>
    <script src="./react.development.js"></script>
    <script src="./react-dom.development.js"></script>
</head>

<body>
    <div id="root"></div>
    <script type="text/babel">
        let root = ReactDOM.createRoot(document.getElementById("root"));
        function App() {
            return (
                <Main />
            )
        }
        class Main extends React.Component {
            constructor(props) {
                super(props);
                this.state = {
                    hi: '哈哈哈哈哈',
                    aa: '小明'
                }
                console.log(this)
                this.handleHi = this.handleHi.bind(this);
            }
            handleHi() {
                console.log('hi', this)
                this.setState({
                    hi: '哈哈'
                })
            }
            //  handleHi=() =>{
            //     console.log('hi',this)
            //     this.setState({
            //         hi:'哈哈'
            //     })
            // }
            render() {
                console.log(this, 'this')
                return (
                    <div>
                        <h1>你好</h1>
                        <h3 onClick={this.handleHi}>{this.state.hi}</h3>
                        {/*<h3 onClick={this.handleHi.bind(this)}>{this.state.hi}</h3>*/}
                        <h3 onClick={()=>{
                            this.setState({
                                aa:'12'
                            })
                        }}>{this.state.aa}</h3>
                    </div>
                )
            }
        }
        root.render(<App />);
    </script>
</body>

</html>