https://blog.wongcw.com/2020/01/23/%e5%82%b3switch%e6%96%b0%e6%a9%9f%e5%9e%8b%e4%b8%8d%e6%9c%83%e6%9c%89%e5%a4%aa%e5%a4%a7%e6%80%a7%e8%83%bd%e6%8f%90%e5%8d%87%e4%b8%8d%e6%94%af%e6%8c%814k%e9%81%8a%e6%88%b2/