Details on how to manipulate DOM element attributes attr () and removeAtrr () _ jQuery-js tutorial

This article describes in detail how jQuery operates DOM element attributes attr () and removeAtrr (), which are very comprehensive and meticulous. We recommend this article to our friends. How to manipulate element attributes in jQuery:
Attr (): read or write the attribute value of the matching element.
RemoveAttr (): removes the specified attribute from the matched element.

Attr () method read operation

The attr () read operation reads the specified attribute value of the first element in the matching element.
Format:. attr (attributeName). Return Value Type: String. undefined will be returned when the nonexistent attribute is read.

Note that the selector selection result may be a set. Here, only the attribute value of the first element in the set is obtained.
Example:

The Code is as follows: