问题来源
安装了zsh-autocomplete 但是 Alt + ↓ 键用不了
我是在 https://github.com/marlonrichert/zsh-autocomplete 这里发现了
Depending on your terminal, not all keybindings might be available to you.
Instead of Alt, your terminal might require you to press Escape, Option or Meta.
In most terminals, Enter is interchangeable with Return, but in some terminals, it is not.
可以用esc!