Such as pictures, part of screenshots, these pictures are all in a ul, if there are 25 pictures. The initial screen displays 10 pictures. When the more button is clicked, all 10 pictures scroll up and are hidden. Scroll down from below are 10 pictures. Only 10 pictures can be displayed at a time. Click again and 5 pictures will be displayed. Finally click to return to the initial state. How to achieve this effect? Please explain it to everyone. No idea