https://htmldom.dev/ 常见应用示例(拖拽/上传/下载/处理图片等), 原生JS
https://1loc.dev/ 一行代码小工具
https://formvalidation.io/ 表单验证库, 无其它依赖
Basic Data Structure, 8种数据类型及区别
Understanding JavaScript Constructors
https://css-tricks.com/understanding-javascript-constructors/
DOM Manipulation
https://zh.javascript.info/document