Javascript has provided insertBefore() method to insert a node as a child before another child. If there are 2 lists we can shuffle the elements between them based on our requirement using the method insertBefore().
syntax
node.insertBefore(newnode, existingnode);
Example-1
In the following example, there are two lists and based on our requirement the lists were shuffled using insertBefore() method. To access the multiple elements in a list we can use their indexes.
<html>
<body>
<ul id="List1"> <li>Tesla </li><li>Solarcity </li> </ul>
<ul id="List2"> <li>Google </li> <li>Drupal </li> </ul>
<script>
var node = document.getElementById("List2").firstChild;
var list = document.getElementById("List1");
list.insertBefore(node, list.childNodes[1]);
</script>
</body>
</html>Output
Tesla Google Solarcity Drupal
Example-2
<html>
<body>
<ul id="List1"> <li>Tesla </li> <li>Solarcity </li> </ul>
<ul id="List2"> <li>Google </li> <li>Drupal </li> </ul>
<script>
var node = document.getElementById("List2").firstChild;
var list = document.getElementById("List1");
list.insertBefore(node, list.childNodes[0]);
</script>
</body>
</html>Output
Google Tesla Solarcity Drupal