react的入门，1，ReactDOM.render
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>react的入门的学习</title>
<script src="js/react.js"></script>
<script src="js/react-dom.js"></script>
<script src="js/browser.min.js"></script>
</head>
<body>
<div ，会报错；
</script>
</body>
</html>