ES6模块化遇到的跨源问题Access to script at ‘X.js‘ from origin ‘null‘ has been blocked by CORS policy... 解决方法

a.js中使用export导出flag，sum：

let flag = true;
function sum(num1, num2) {
  return num1 + num2
}

if (flag) {
  console.log(sum(1, 2));
}

export {
  flag,
  sum
}

b.js中使用import导入flag，sum：

import { flag, sum } from './a.js';
console.log(flag);
if (flag) {
  console.log(sum(100, 200));
}

index.html引入a.js、b.js：

<!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" src="./a.js"></script>
  <script type="module" src="./b.js"></script>
</body>
</html>

直接在浏览器中预览时报错：跨源请求仅支持协议方案

解决方法：

在VSCode中安装live server插件：

在index.html文件中右键：“Open with Live Server”，正常输出结果：

ES6模块化遇到的跨源问题Access to script at ‘X.js‘ from origin ‘null‘ has been blocked by CORS policy... 解决方法

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