30days 

https://github.com/wesbos/JavaScript30

https://github.com/soyaine/JavaScript30

reference doc

https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Number

online 

https://www.liaoxuefeng.com/wiki/1022910821149312

https://gitee.com/explore/all?lang=JavaScript&order=starred