Simple menu folding code based on JQuery _ jquery

Using JQUERY, you can simply fold the functional menu. I am a beginner. I write a little more at the background and seldom write the foreground effect. Please give me more advice. The menu is Level 2 and collapsed during initialization. Click the title of the item to display the Level 2 list.
The HTML code is as follows:

The Code is as follows:

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Among them, JQUERY script can achieve the desired effect with just a few simple lines. The Code is as follows:


The Code is as follows: