how to add/remove/toggle/view by class list item wise and see the lenth of the classList using classList method in javscript

how to add/remove/toggle/view by class list item wise and see the lenth of the classList using classList method in javscript

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Test Page</title>
  <script src="main.js"></script>
</head>
<body>

<div id="outer">

      <h1 id="selector" style="border: 2px solid dodgerblue; padding : 2px"> RUSTIC TRAVEL JUNKIE</h1>

      <p id="para">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Illum ipsam blanditiis voluptatibus et, cumque expedita, quam ea! Dolorem obcaecati, fuga, culpa neque, repellat laudantium libero sed sint veritatis praesentium vitae cumque ratione eveniet optio, aspernatur ab. </p>

      <button id="inner">CLICK ME</button>

</div>
<script>

document.getElementById("outer").classList.add("classStyle","classColor");
// var a  = document.getElementById("outer").classList;
// console.log(a);

//now i want to toggle one of the classes i.e classStyle
  document.getElementById("outer").addEventListener("click", abc);

  function abc() {
  // document.getElementById("outer").classList.toggle("classStyle");

  // now i want to see the elements of class item wise
  var a = document.getElementById("outer").classList.item(1);
  console.log(a);
}

</script>

</body>
</html>


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