vanilla(香草) JavaScript 是什么

在视频中反复看到这个词，不知道是什么，搜索了一下，发现指的纯粹的JavaScript (pure JavaScript, 或者 plain JavaScript)，没有使用任何框架或库的JavaScript。

The term vanilla script is used to refer to the pure JavaScript (or we can say plain JavaScript) without any type of additional library.
You SHOULD Learn Vanilla JavaScript Before JS Frameworks

Using “VanillaJS” means using plain JavaScript without any additional libraries like jQuery.

People use it as a joke to remind other developers that many things can be done nowadays without the need for additional JavaScript libraries.
–Koen Peters