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console 命令行工具 X clear

                    
>
console
class LiftCircle extends React.Component {
    constructor(){
        this.state = { 
            msg:'hello , this is a message!'
         }
    }
    componentDidMount(){
        console.log('componentDidMount');
    }
    componentDidUpdate(){
        console.log('componentDidUpdate');
    }
    render(){
        const { msg } = this.state;
        return (
            <div>
                {msg}
                <p>
                    <button onClick={ 
                        () => { this.setState({ msg: 'change msg' }) } 
                    }>btn1111</button>
                </p>
            </div>
        )
    }
};

ReactDOM.render(<LiftCircle />, document.getElementById('root'));
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=, initial-scale=">
	<meta http-equiv="X-UA-Compatible" content="">
	<title></title>
</head>
<body>
	<div id='root'></div>
</body>
</html>

本项目引用的自定义外部资源