返回值:BooleanhasClass(className)
Determine whether any of the matched elements are assigned the given class.
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1.2 新增hasClass(className)
className (String) The class name to search for.
Elements may have more than one class assigned to them. In HTML, this is represented by separating the class names with a space:
<div id="mydiv" class="foo bar"></div>
The .hasClass() method will return true if the class is assigned to an element, even if other classes also are. For example, given the HTML above, the following
will return true:
$('#mydiv').hasClass('foo')
as would:
$('#mydiv').hasClass('bar')
示例:
Looks for the class 'selected' on the matched elements.
<!DOCTYPE html>
<html>
<head>
<style>
p { margin: 8px; font-size:16px; }
.selected { color:red; }
.highlight { background:yellow; }
</style>
<script src="jquery.min.js"></script>
</head>
<body>
<p>Hello</p>
<p class="selected">Goodbye</p>
<div id="result1">First paragraph has selected class: </div>
<div id="result2">Last paragraph has selected class: </div>
<div id="result3">Some paragraph has selected class: </div>
<script>
$("div#result1").append($("p:first").hasClass("selected").toString());
$("div#result2").append($("p:last").hasClass("selected").toString());
$("div#result3").append($("p").hasClass("selected").toString());
</script>
</body>
</html>