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