- If async="async": The script is executed asynchronously with the rest of the page (the script will be executed while the page continues the parsing)
- If async is not present and defer="defer": The script is executed when the page has finished parsing
- If neither async or defer is present: The script is fetched and executed immediately, before the browser continues parsing the page
本文转载自：https://www.w3schools.com/Tags/tag_script.asp
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