react-demos/demo03/index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>React Component</title>
</head>
<body>
    <div id="root"></div>

    <script src="../libs/react.min.js"></script>
    <script src="../libs/react-dom.min.js"></script>
    <script src="../libs/babel.min.js"></script>
    <script type="text/jsx">

        // 1、类组件，需要继承 React.Component，render 函数的执行结果会被作为界面展示内容
        class ClassComponent extends React.Component {
            render() {
                return (
                    <div>
                        <h1>Hello, Class Component</h1>
                    </div>
                );
            }
        }

        // 2、函数组件，本身就是一个函数，函数的执行结果会被作为界面展示内容
        const FunctionComponent = () => {
            return (
                <div>
                    <h1>Hello, Function Component</h1>
                </div>
            );
        }

        const App = () => (
            <div>
                <ClassComponent />
                <FunctionComponent />
            </div>
        )

        ReactDOM.render(<App />, root);
    </script>
</body>

</html>