ES6中class繼承原理

參考文章：
https://wulv.site/2017-05-29/%E4%BB%8EES6%E4%B8%AD%E7%9A%84extends%E8%AE%B2js%E5%8E%9F%E5%9E%8B%E9%93%BE%E4%B8%8E%E7%BB%A7%E6%89%BF.html
https://blog.csdn.net/m0_37722811/article/details/84343227
https://juejin.im/post/5a96d78ef265da4e9311b4d8#heading-9
https://juejin.im/post/5ab31129f265da2378402cb3
https://segmentfault.com/a/1190000014798678
https://segmentfault.com/a/1190000017816134