jQuery addClass() remove class and add class

Introduction

Change class name of the last p element

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<!DOCTYPE html>
<html>
<head>
<script 
 src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>/*from w  w  w . j a  v a2s  .c o m*/
<script>
$(document).ready(function(){
  $("button").click(function(){
    $("p:last").removeClass("intro").addClass("main");
  });
});
</script>
<style>
.intro {
  color: red;
}
.main {
  background-color: yellow;
}
</style>
</head>
<body>

<h1>This is a heading</h1>

<p>This is another paragraph.</p>
<p class="intro">This is a paragraph.</p>

<button>Test</button>

</body>
</html>



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