How does HTML add a specified style class name for each matching element

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.addClass (className)

Description: adds the specified style class name for each matching element

Added version: 1.0.addClass (className)

ClassName

Type: String

One or more style names to be added to each matching element.

Added version: 1.4.addClass (function (index, currentClass))

Function (index, currentClass)

Type: Function ()

This function returns one or more style names to be added separated by spaces. The receive index parameter represents the index position of the element in the matching collection and the html parameter represents the original HTML content on the element. In the function, this points to the current element in the set of matching elements.

It is worth noting that this method does not replace a style class name. It simply adds a style class name to the element.

You can add multiple style class names separated by spaces to all matching elements at a time, like this:

$("p") .addClass ("myClass yourClass")

This method is usually used with .removeClass () to switch the style of an element, like this:

RemoveClass ("myClass noClass") .addClass ("yourClass")

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