問題描述：通過html的script標簽引入React庫，再引入React組件報錯。
錯誤的代碼
<script tsrc="./js/Square.js"></script>
添加babel
<script src="https://unpkg.com/babel-standalone@6.26.0/babel.min.js"></script>
<script type="text/babel" src="./js/Square.js"></script>
babel的最新版本可以到https://github.com/babel/babel-standalone查看
