<!DOCTYPE html>
<html>
<body>
<p>Click the button to add elements to the beginning of the array.</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
var fruits = ["Banana", "Orange", "Apple", "Mango"];
document.getElementById("demo").innerHTML = fruits;
function myFunction() {
fruits.unshift("Lemon", "Pineapple");
document.getElementById("demo").innerHTML = fruits;
}
</script>
<p><b>Note:</b> The unshift() method does not work properly in Internet Explorer 8 and earlier: the values will be inserted, but the return value will be <em>undefined</em>.</p>
</body>
</html>