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Use jquery to determine whether an element contains a specified class instance, jqueryclass

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Use jquery to determine whether an element contains a specified class instance, jqueryclass

In jquery, two methods can be used to determine whether an element contains a definite class ). The two methods have the same functions.

The two methods are as follows:

1. is ('. classname ')

2. hasClass ('classname ')

The following is an example of whether a div element contains a redColor:

1. Use the is ('. classname') Method

$ ('Div '). is ('. redcolor ')

2. Use the hasClass ('classname') method (note that the earlier version of jquery may be hasClass ('. classname '))

$ ('Div '). hasClass ('redcolor') The following is an example of checking whether an element contains a redColor class. If the element contains a redColor class, the class is changed to blueColor.

<!DOCTYPE html>

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