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Today, the editor will share with you the relevant knowledge points about how to use HasClass (className). The content is detailed and the logic is clear. I believe most people still know too much about it, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

.hasClass (className)

Description: determines whether any matching element has a given (style) class assigned.

Added version: 1.2.hasClass (className)

ClassName

Type: String

The name of the style to query.

The element may have a style name of. In HTML, use spaces to separate multiple styles:

If there is a specified style on the matching element, the .hasClass () method returns true, even though there may be other styles on the element. For example, adding the following code to the HTML above returns true:

$('# mydiv'). HasClass ('foo')

You can also:

$('# mydiv'). HasClass ('bar')

However, this returns false:

$('# mydiv'). HasClass ('quux')

Example:

Look for the 'selected' style on the matching elements.

P {margin: 8px; font-size:16px;}

.selected {color:red;}

This paragraph is black and is the first paragraph.

This paragraph is red and is the second paragraph.

First paragraph has selected class:

Second paragraph has selected class:

At least one paragraph has selected class:

$("div#result1") .append ($("p:first") .hasClass ("selected") .toString ()

$("div#result2") .append ($("p:last") .hasClass ("selected") .toString ()

("div#result3") .append ($("p") .hasClass ("selected") .toString ()

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