How to get link in variable

How to get link in variable

One link is defined of "et_pb_more_button et_pb_button et_pb_button_one" class, I want to use this link in my script. Can you please tell me what should i write to extract the link 

<a href=" http://www.facebook.com" class="et_pb_more_button et_pb_button et_pb_button_one">fl</a>


<script>
var href = ??
</script>