If I have an array of buttons, how can I tell which button was clicked? example below

 var i=0
 CreateButton = new function () {
    savebutton[i]=NewButton()
  i++
  }

every time a user runs the function a new button is generated. the first button is savebutton[0] the second is savebutton[1] and so on potentially infinity times.

when later the user presses the button I want the screen to alert it's index number (or 'i').

is there any way to make this work in arrays?