我有一个静态数组，并在我的课，并通过这种方法我把一些功能在阵列中的静态方法。该方法被称为上的时间表，所以当我打两次架，将推动功能两次，依此类推。

I have a static Array and a static method in my class and via this method I push some functions in the array. The method is called on timeline so when I play the frame twice it will push the function twice and so on.

问： 如何检查是否函数存在和prevent重复？ （很喜欢的addEventListener）

Question : How can I check if the function exists and prevent duplication? ( it is like addeventlistener )

短版：不要在时间轴上的code

short version: don't code on the timeline.

长版：如果你是幸运的功能是一样的，所以它可以使用 == 运营商对它们进行比较。但如你编码在时间轴上，也有可能是相同的函数的几个实例，所以这将无法工作。你可以保存一个静态布尔表示，如果你已经添加了。

long version: if you're lucky the functions would be the same, so it's possible to compare them using the == operator. but as you're coding on the timeline, there may be several instances of the same function, so this won't work. You could save a static Boolean indicating if you've already added it.

但！开始编码类，它会为你节省很多的麻烦，从长远来看，并给你更好的答案在这里对堆栈溢出 - 这有点像问一个5星级厨师，为什么你只，加水和 - shake- togehter蛋糕并没有变成非常大的。

BUT! Start coding in classes, it will save you a lot of trouble in the long run, and give you much better answers here on Stack Overflow -- it's kinda like asking a 5 star chef why your only-add-water-and-shake-togehter-cake didn't turn out very great.