clipboard data does not update in fist time.

[zhendong590]

i have a problem about ng-clip step 1: i copy a data by ctrl + c,it works well 'aaa' step 2: i click a button (use ng-clip) 'bbb' step 3: ctrl + v ,the result is 'aaa' step 4: ctrl + v ,the result is 'bbb'

i don't know why , This is my code link.