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<!DOCTYPE html>
<html>
<head>
<script src="../../ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
<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>Peter</li>
  <li>Lois</li>
  <li>Chris</li>
  <li>Stewie</li>
</ul>
​
<button>Add/remove classes to list items</button>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jquery/tryit.asp?filename=tryjquery_html_toggleclass_func by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:33:38 GMT -->
</html>
​
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