jQuery toggleClass() with callback function

Introduction

Add/remove classes to list items

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<!DOCTYPE html>
<html>
<head>
<script 
 src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js">
</script>/* w  ww  .  j  a v  a  2s.c  o  m*/
<script>
$(document).ready(function(){
  $("button").click(function(){
    $("li").toggleClass(function(n){
      return "listitem_" + n;
    });
  });
});
</script>
<style>
.listitem_1, .listitem_3 {
  color: red;
}

.listitem_0, .listitem_2 {
  color: blue;
}
</style>
</head>
<body>

<h1>This is a heading</h1>

<ul>
  <li>A</li>
  <li>B</li>
  <li>C</li>
  <li>D</li>
</ul>

<button>test</button>

</body>
</html>



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