You can run the code by using Ctrl + Enter in paiza.io
这是此脚本的所有版本。 只显示代码更新过的版本
Update
Refactor the code. Use `querySelector` instead of `getElementsByClassName`
Add local Japanese information
refactor the code
Use `event.key` to remove old `event.keyCode`
refactoring
from unsafe `@include` to `@match`
