http://plnkr.co/edit/7QhluNzJXb7nhcpv8nQE?p=preview
on this example, line 12 is work, but line 13 dosen't why -- You received this message because you are subscribed to the Google Groups "AngularJS" group. To unsubscribe from this group and stop receiving emails from it, send an email to angular+unsubscr...@googlegroups.com. To post to this group, send email to angular@googlegroups.com. Visit this group at http://groups.google.com/group/angular. For more options, visit https://groups.google.com/d/optout.
