jquery method to determine whether class exists

Jquery method to determine whether a class exists: 1. Use the "is('.classname')" method to determine whether a class exists; 2. Use the "hasClass('classname')" method to determine whether a class exists.

The operating environment of this tutorial: windows7 system, jquery1.10.0 version, thinkpad t480 computer.

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jquery determines whether a class exists

The two methods are as follows:

● hasClass('classname')

● is('.classname')

Example:

1. Use is('.classname') method

$('div').is('.redColor')

2. Method of using hasClass('classname')

$('div').hasClass('redColor')

Extended information:

Introduction to jquery's hasclass() and is() that appear above

1, is()

is(expr|obj|ele|fn)

Detect the set of matching elements based on the selector, DOM element or jQuery object, if at least Returns true if an element matches the given expression.

If no element matches, or the expression is invalid, 'false' is returned. '''Note:''''Support for all expressions is only available in jQuery 1.3. In previous versions, if complex expressions, such as hierarchical selectors (for example, ~ and > ), were provided, they would always return true

2. hasclass()

checks the current Whether the element contains a specific class, if so, returns true.

This is actually is("." class).

Description: Perform an animation on an element containing a certain class.

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