module导入script方式

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type="module"

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<!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>

    <script type="module">
      // will not block the button
      console.log(this) // undefined
      console.log(import.meta.url) // the url of import file
    </script>
    <script>
      // will block the button
      console.log(this) // window
    </script>

    <script async type="module" src="http://example.com/test.js">
      // will run immediate when the file is load
      // example.com needs the Access-Control-Allow-Origin flag
      import {sayHi} from 'sayHi' // this will get error because no path import in this module block.
    </script>

    <script nomodule>
      alert("The Browser can not support the module import.")
    </script>
  </head>
  <body>
    <button>Button</button>
  </body>
</html>