javascript - How to make the body's background image display in full screen at different resolutions? Small resolutions have vertical scroll bars, and the extra content has no background? How to deal with it?

Question

I have a large screen resolution and the background is displayed in full screen without any problem. When I switch to a small screen, the scrolling content has no background. How can I solve it?
Code:

Answer 1

Your height is written as 100%. Of course there will be no background when the scroll appears

Answer 2

body settings
background-size:cover;
overflow:hidden;