How to use addclass () of jquery

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In jquery, the addclass () method is used to add one or more classes to the selected element with the syntax of "$(selector) .addClass (" class name ")"; if you want to add multiple classes, you need to separate the class names with spaces.

The operating environment of this tutorial: windows7 system, jquery1.10.2 version, Dell G3 computer.

In jquery, the addclass () method is used to add one or more classes to the selected element.

This method does not remove the existing class attribute, but simply adds one or more class attributes.

Tip: if you need to add more than one class, separate the class names with spaces.

Grammar

$(selector) .addClass (class)

Also use functions to add classes to selected elements

$(selector) .addClass (function (index,oldclass))

Example:

Add a class to the first p element

$(document) .ready (function () {$("button") .click (function () {$("p:first"). AddClass ("intro");}) .intro {font-size: 120%; color: red;} this is a big title

This is a paragraph.

This is another paragraph.

Add a class to the first p element

Add two classes to the element

$(document) .ready (function () {$("button") .click (function () {$("p:first"). AddClass ("intro note");}) .intro {font-size: 120%; color: blue;} .note {background-color: yellow } this is a big title.

This is a paragraph.

This is another paragraph.

Add a class to the first p element

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