Get the ask code corresponding to the key pressed by the keyboard

1. Build a HTML5 page
Just use one element as a container , Such as ：

2. Create another style sheet
Style the container to make it more beautiful

3. Build another one js surface
To introduce jq To achieve the effect

4. When it's all done , Open the page
First, I just went in and didn't click any key

Then click enter , Such as ：

Finally completed , Provides shortcuts for future project keyboard events ！