Why is click event executed twice?

i want to konw why click event is executed twice?
see: http://ionicframework.com/docs/api/service/$ionicPopup/
When i click the Alert button,the dialog box appears twice.

Are you able to put up a codepen with an example of this issue?


I only see a single popup when clicking alert, is this not what you’re seeing/wanting?

This issue will appear on IE11.
I tested it on firefox and chrome,I only see a single popup too.

Thank you for your reply!

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