Based on jquery, the background left menu clicks to slide up and down to display_jquery

Today I made a left menu effect. This effect should be used frequently when working in the background. The code is also concise and clear. You can copy it and use it:
The effect picture is as follows:

Code As follows: (The icons of the up and down arrows are as above, the icons can be changed by yourself)

Copy the code The code is as follows:

Title 1

First item

Second item

Third item

< /dd>

Title 2

First item< ;/p>

Second item

Title three

First item

Second item< /p>

The third item

Title 4

First item

< ;a href="#">Second item

Third item