小例子：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</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="example1"></div>
<div id="example2"></div>
<script type="text/babel">
function MyComponent1(){
return <h1>Hello React, function Component!</h1>
}
class MyComponent2 extends React.Component{
render(){
return <h1>Hello React, class Component!</h1>
}
}
ReactDOM.render(<MyComponent1/>, document.getElementById('example1'))
ReactDOM.render(<MyComponent2/>, document.getElementById('example2'))
</script>
</body>
</html>