Javascript: Automatically clicking a button?

Question

I'm learning how to write a chrome extension, and I'm fairly new to javascript.

Here's some html:

<div class="button data" style="">
   <a class="button1 whiteColor" href="http://link1.com">VIEW This</a>
   <a class="button2 redColor" href="http://link2.com">VIEW That</a>
</div>

What I want to do is open link2.com by automatically clicking button2 using javascript.

I'm using the following, but it's not working :/

document.getElementByClassName("button2 redColor").click();

Any help would be appreciated!!

Solution

document.getElementsByClassName("button2 redColor")[0].click();

You need select index, because getElementsByClassName return the array