We can change the background color of the members of the list using filter() function in jQuery.

Note: The filter() function matches each element with the supplied selector and  creates a subset of the matching elements.

Let us understand with the help of an example:

Following is the list of elements from which I have to change the background color of the elements at even  position:

 <ul>
        <li>list item 1</li>
        <li>list item 2</li>
        <li>list item 3</li>
        <li>list item 4</li>
        <li>list item 5</li>
        <li>list item 6</li>
    </ul>

Let us take a button that will change the color of the elements at even  position onclick.

 <input type="button" onclick="ChangeColor()" />

Now write the following function inside the script tag:

function ChangeColor() {

            $("li").filter(":even").css("background-color", "red");
        }

This will change the color of the 1,3,5 element as the index starts from 0, So elements at index 0,2 and 4 will get their background color changed.

                                                    Hope it helps.... Happy Coding !