store version in variable

js/issuer.js

@@ -1,9 +1,10 @@
 $(function () {
   'use strict';
 
-  if ('1' !== window.localStorage.getItem('version')) {
+  var version = '1';
+  if (version !== window.localStorage.getItem('version')) {
     window.localStorage.clear();
-    window.localStorage.setItem('version', '1');
+    window.localStorage.setItem('version', version);
   }
 
   var OAUTH3 = window.OAUTH3;