引用import的JS报错：Access to script at 'file:' from origin 'null' has been blocked by CORS policy的解决方案

示例代码

test.html

<!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>Document</title>
</head>
<body>
  <script type="module">
    import a from './a.js'; //报错行
    console.log("a:", a)
  </script>
</body>
</html>

a.js

console.log("a.js");
let a = 1;
export default a;

控制台报错

Access to script at 'file:///C:/Users/%E7%8E%8B%E6%82%A6/Desktop/websocket_test/a.js' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, chrome-untrusted, https.

别的浏览器都可以，而在唯独谷歌浏览器报错，原因大概是谷歌浏览器安全机制导致的，不允许在本地直接运行，会当作跨域访问。

解决方法

vs code 下载Live Server插件

在html文件下，点击Go Live运行html即可！

解决Access to script at 'file:' from origin 'null' has been blocked by CORS policy

示例代码

控制台报错

解决方法