jrburke/requirejs — pull request #193 by normanzb (2012-02-26 18:37:57+00:00)
Title: a quick fix to safely determine if attachEvent is natively supported 

1.a quick fix to safely determine if attachEvent is natively supported
(https://github.com/jrburke/requirejs/issues/187)
2. make 'undefined' became local variable to prevent error when 'undefined' is accidentally overwitten.