Setting EventTrigger in Unity with JavaScript

I'm currently trying to add onClick methods to a button created at runtime. I have tried searching but can only find c# examples, could anyone help me or direct me as to how I would go about this using JavaScript, the following code is the button I have made.

 GUI.Button(new Rect(280, 240, 50, 30), items[1]);

ps: I have tried using the c# examples but they just created errors so I haven't included my attempts.