How to create arrays in JavaScript?

We can declare an array like this 
var scripts = new Array(); 
We can add elements to this array like this

scripts[0] = "PHP";
scripts[1] = "ASP";
scripts[2] = "JavaScript";
scripts[3] = "HTML";

Now our array scrips has 4 elements inside it and we can print or access them by using their index number. Note that index number starts from 0. To get the third element of the array we have to use the index number 2 . Here is the way to get the third element of an array. 
document.write(scripts[2]); 
We also can create an array like this 
var no_array = new Array(21, 22, 23, 24, 25);