Use JS to implement a TreeMenu effect sharing_Basic knowledge

Let me share with you a little thing I learned today.
Similar to the TreeMenu control.
No nonsense code directly:

Copy the code The code is as follows:

Html code:
//There is nothing to say in this code. The main thing is that the Id corresponds to the Id in the js code.

Copy code The code is as follows:

-No website status

< ;ul id="ulMenu3">

Baidu

Baidu

< a href="http://www.baidu.com" target="_blank">Or Baidu