Simulated drop-down box code implemented with jQuery_jquery

Many group members have asked questions about the beautification of drop-down boxes. Now I will describe the production process of beautifying drop-down boxes. It is actually a simulated drop-down box.
Question 1: Why simulate a drop-down box?
1. The drop-down box style that comes with the browser is not good-looking.
2. Under IE6, the priority of the drop-down box is greater than that of the layer, which often causes the drop-down box to be displayed above the layer.
OK, after understanding this problem, we started to use jQuery to create a simulated drop-down box.

Step one: Build the structure first
This is the ordinary drop-down box code:
XML/HTML code