MediaWiki:Gadget-purgetab.js

Note: After saving, you may have to bypass your browser's cache to see the changes. Mozilla / Firefox / Safari: hold down Shift while clicking Reload, or press Ctrl-Shift-R (Cmd-Shift-R on Apple Mac); IE: hold Ctrl while clicking Refresh, or press Ctrl-F5; Konqueror: simply click the Reload button, or press F5; Opera users may need to completely clear their cache in Tools→Preferences. — More skins

/* Purge caption button */
addOnloadHook(function () {
   var hist; var url;
   var actionPortlet = "p-cactions";
   var purgeText = (skin === "vector" ? "Purge (*)" : "*");
   if (!(hist = document.getElementById('ca-history') )) return;
   if (!(url = hist.getElementsByTagName('a')[0] )) return;
   if (!(url = url.href )) return;
   addPortletLink(actionPortlet, url.replace(/([?&]action=)history([&#]|$)/, '$1purge$2'),
                  purgeText, 'ca-purge', 'Purge cache', '*');
});