application.js: randomKey function optimization (#13826)

Contributed by Filou Centrinov.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11741 e93f8b46-1217-0410-a6f0-8f06a7374b81

public/javascripts/application.js

 }
 
 function randomKey(size) {
-  var chars = new Array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z');
+  var chars = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
   var key = '';
-  for (i = 0; i < size; i++) {
-    key += chars[Math.floor(Math.random() * chars.length)];
+  for (var i = 0; i < size; i++) {
+    key += chars.charAt(Math.floor(Math.random() * chars.length));
   }
   return key;
 }