npm：npm install --save-dev @babel/preset-react
cdn：https://unpkg.com/babel-standalone@6.26.0/babel.js

cdn引入使用

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>babel</title>
    <script src="https://unpkg.com/babel-standalone@6.26.0/babel.js"></script>
</head>
<body>
    
</body>
</html>
<script type="text/babel">

</script>