jQuery.hasClass () function Detailed

jQuery.hasClass () function Detailed

hasClass()Function is used to indicate the current element jQuery whether the matched objects containing specified css class name .

This function belongs to jQuerythe object (instance).

grammar

JavaScript:

jQueryObject.hasClass( className )

parameter

parameter	description
className	String type specified css class name.

return value

hasClass()The return value is a Boolean type, returns a boolean value specifies whether to include css class names, if you include returns true, otherwise it returns false.

If the current jQuery object matching a plurality of elements, as long as there is any element comprising css specified class name is returned true.

Examples & Description

hasClass(className)Function is equivalent to is(".className"):

JavaScript:

$element.hasClass( className );
// 等价于
$element.is( "." + className );

HTML paragraph with the following code as an example:

HTML:

<div id="n1">
    <p id="n2" class="site-name">CodePlayer</p>
    <p id="n3" class="foo bar demo">专注于编程开发技术分享</p>
</div>

We write the following jQuery code to demonstrate the hasClass()use of the function:

JavaScript:

var $n2 = $("#n2");
document.writeln( $n2.hasClass("site-name") ); // true

var $n3 = $("#n3");
document.writeln( $n3.hasClass("bar") ); // true
// 不存在该css类名，返回false
document.writeln( $n3.hasClass("noClass") ); // false

var $p = $("p");
// 只要jQuery对象匹配的元素中有任意一个元素包含指定的css类名，即返回true
document.writeln( $p.hasClass("site-name") ); // true
document.writeln( $p.hasClass("foo") ); // true