hang on 和 wait 有什么区别？如果难以说明的话，请教我一下例句。

I think it’s the same.

“Hang on, while I grab my keys.”
“Wait, while I grab my keys”

You can also say “hold on”
“Hold on while I grab my keys.”

I don’t really use “hang on” but I think it’s used more when you are answering...
“Come and get your chores done”
“Hang on...”
It may be a little less demanding. Wait seems like more of a command.