Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <body> <p id="demo">Click the button to add elements to the array.</p> <button onclick="myFunction()">Try it</button> <script> function myFunction() { var fruits = ["Banana", "Orange", "Apple", "Mango"]; fruits.unshift("Lemon","Pineapple"); var x=document.getElementById("demo"); x.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>
Result:
W3Schools.com - Try it yourself