> For the complete documentation index, see [llms.txt](https://jonathan-zhang.gitbook.io/javascript-steppitguide/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jonathan-zhang.gitbook.io/javascript-steppitguide/master.md).

# 封面

![](https://2749833347-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-MGDQNxeIHqAznfqMZXF%2Fsync%2F23e63e7374229ee6e4607d5e91415c7b7c735449.png?generation=1599043657717268\&alt=media)