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<!DOCTYPE html> <html> <body> <p>Click the button to copy the first two array elements to the last two array elements.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <p><strong>Note:</strong> The copyWithin() method is not supported in IE 11 (and earlier versions).</p> <script> var fruits = ["Banana", "Orange", "Apple", "Mango"]; document.getElementById("demo").innerHTML = fruits; function myFunction() { document.getElementById("demo").innerHTML = fruits.copyWithin(2,0); } </script> </body> </html>