Simple and practical code for the focus chart commonly used in malls _ jquery

This effect is used more frequently on the Internet, but most of them are plug-ins, or the JavaScript code is too complicated. It seems difficult for kids shoes, which is relatively simple, if you are interested, you can refer to the following: there are a lot of online effects of such a mall, but most of them are plug-ins, or JS is too complicated to write, it looks hard for children's shoes to learn, this looks simple, it is also easy to understand. Please watch out for all your children's shoes. You are also welcome to comment and paste the code (For ease of use, you can copy the code and use it without adding anything else ):

The Code is as follows:

The effects of common scrolling in malls are simple and practical.