> For the complete documentation index, see [llms.txt](https://simian114.gitbook.io/blog/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://simian114.gitbook.io/blog/undefined/backbonejs/issue.md).

# ISSUE

1. CDN으로 backbone을 인클루드 할 때 무조건 `underscore` 를 넣고 `backbone` 을 넣어줘야 한다.
   * [참고](https://stackoverflow.com/questions/4875743/backbone-js-extend-undefined)