How do I script signout process for SharePoint 2013 in JavaScript?

I am looking to set up a custom signout button within SharePoint 2013.  I would like to clear the fedauth cookie as a part of the process.  Has anyone written a javascript to accomplish this?
CKH00629Asked:
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Jayaraja JayaramanSharepoint Architect ConsultantCommented:
This si for adding sign in as different user
javascript:void(window.location.href='/_layouts/closeConnection.aspx?loginasanotheruser=true&Source=' + encodeURIComponent(window.location.href));

OR

<script type="text/javascript">
    function Timeout(){
        var t = setTimeout("RedirectToLogout()", 20*60000);
    }
    function RedirectToLogout(){
       var path = SP.Utilities.Utility.getLayoutsPageUrl("SignOut.aspx");
       window.navigate(path);
    }
    </script>
i have added this script in body section

<script>
    window.onload=Timeout;
</script>

Or in more easy
<a href="_layouts/signout.aspx">log out</a>
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GaryCommented:
I've requested that this question be deleted for the following reason:

The question has either no comments or not enough useful information to be called an "answer".
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