JS：在调用之前添加函数，如何不接收错误？

I have a function that adds a skill button to the game I am creating. One of the things I would like to do at the game start-up is add some of the functions in my INIT object. However, because i'm calling INIT and these functions BEFORE the actual function gets read by javascript, it throws a error. Now I could just leave my code as it, but I don't like my code dangling around. I want it neat and tidy. Is there a way to fix this? to t