无法从 unpkg 中检索 react-dom.development.js

Question

我正在学习 ReactJS 并尝试运行 https://raw.githubusercontent.com/kirupa/kirupa/master/reactjs/helloworld_batman.htm (this is from the instructions at https://www.kirupa.com/react/building_your_first_react_app.htm 处的代码）。

使用 Chrome，"Batman" 永远不会显示，Chrome 开发人员工具记录以下错误：

Access to script at 'https://unpkg.com/react-dom@16.7.0/umd/react-dom.development.js' (redirected from 'https://unpkg.com/react-dom@16/umd/react-dom.development.js') from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.

果然，当直接请求 react-dom.development.js 时，“网络”选项卡显示缺少 header。

其他注意事项：

请求反应时header存在。development.js直接
https://reactjs.org/docs/cdn-links.html 中的说明显示以这种方式从 unpkg 中检索文件
IE 11不存在该问题

我做错了什么？

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8" />
  <title>React! React! React!</title>
  <script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
  <script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>

  <style>
    #container {
      padding: 50px;
      background-color: #EEE;
    }
    #container h1 {
      font-size: 144px;
      font-family: sans-serif;
      color: #0080a8;
    }
  </style>
</head>

<body>
  <div id="container"></div>
  <script type="text/babel">
    var destination = document.querySelector("#container");
    ReactDOM.render(React.createElement(
      "h1",
      null,
      "Batman"
    ), destination);
  </script>
</body>

</html>

Answer 1

事实证明，如果我取出 "crossorigin" 那么它在 Chrome 中有效！

在 With <script crossorigin='anonymous'>, why is a script "blocked by CORS policy"?

上对此进行了讨论

无法从 unpkg 中检索 react-dom.development.js

Unable to retrieve react-dom.development.js from unpkg

reactjs

unpkg