jQuery uses andSelf() to include the previous selection set_jquery

When we use Destructive Method to select and filter the wrapper set, a new result set will be generated. For example:

html

$lt;div$gt;
$lt;p$gt;Paragraph$lt;/p$gt;
$lt;p$gt ;Paragraph$lt;/p$gt;
$lt;/div$gt;

For the above DOM Tree, of course you can use

$('div').find ('p')

to get the p elements contained in all div elements, but the selection result will definitely not include the div element itself.
If you call andSelf() in a chain after find, you can also include previous selection($('div')) in the result set.

Usage example

For the above html code, use

$('div').find('p').css('border', '1px solid # 993300');

The css effect can only be applied to p elements

But if andSelf() is added after find(), the css effect will also be applied to all div elements