To add an element in the last, use the JavaScript push() method. JavaScript array push() method appends the given element(s) in the last of the array and returns the length of the new array.
Example
You can try to run the following code to add an element in the last of the array −
<html>
<head>
<title>JavaScript Array push Method</title>
</head>
<body>
<script>
var numbers = new Array(30, 70, 75, 90);
var length = numbers.push(100);
document.write("new numbers are : " + numbers );
length = numbers.push(200);
document.write("<br />new numbers are : " + numbers );
</script>
</body>
</html>Output
new numbers are : 30,70,75,90,100 new numbers are : 30,70,75,90,100,200