The hasClass() method checks if any of the selected elements have a specified class name.If ANY of the selected elements has the specified class name, this method will return "true".
Syntax
$(selector).hasClass(classname)
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Example
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
alert($("p").hasClass("intro"));
});
});
</script>
<style>
.intro {
font-size: 120%;
color: red;
}
</style>
</head>
<body>
<h1>This is a heading</h1>
<p class="intro">This is a paragraph.</p>
<p>This is another paragraph.</p>
<button>Does any p element have an "intro" class?</button>
</body>
</
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