javascript - Simulate the takeaway click menu of the mobile webapp and slide the corresponding content to the target position

Question

1. When the content on the right slides to the specified position with your finger, the corresponding click menu on the left changes color, or changes the corresponding position?
2. Note that the mobile terminal does not allow me to monitor the entire mouse scroll!
3. Waiting online! It’s urgent!

Answer 1

Brother, are you hungry too? Will you take orders automatically?

Answer 2

Switch the corresponding class on the left through the srollTop of each block on the right