关于as3代码的求助

代码是哪里出了问题？
只有0,9,和“.”的按钮能用
或者说是代码太多且重复，有没有什么办法整合一下？
按照官方的教程学的，目前我只会做这种函数
@网雨霏霏
zero_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberZero)
one_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberOne)
two_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberTwo)
three_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberThree)
four_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberFour)
five_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberFive)
six_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberSix)
seven_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberSeven)
eight_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberEight)
nine_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberNine)
comma_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberComma)
point_btn.addEventListener(MouseEvent.CLICK, fl_AddNumberPoint)
function fl_AddNumberZero(event:MouseEvent):void {
output.appendText("0")
}
function fl_AddNumberOne(event:MouseEvent):void {
output.appendText("1")
}
function fl_AddNumberTwo(event:MouseEvent):void
{output.appendText("2")
}
function fl_AddNumberThree(event:MouseEvent):void
{output.appendText("3")
}
function fl_AddNumberFour(event:MouseEvent):void {
output.appendText("4")
}
function fl_AddNumberFive(event:MouseEvent):void
{output.appendText("5")
}
function fl_AddNumberSix(event:MouseEvent):void
{output.appendText("6")
}
function fl_AddNumberSeven(event:MouseEvent):void
{output.appendText("7")
}
function fl_AddNumberEight(event:MouseEvent):void
{output.appendText("8")
}
function fl_AddNumberNine(event:MouseEvent):void
{output.appendText("9")
}
function fl_AddNumberComma(event:MouseEvent):void
{output.appendText(",")
}
function fl_AddNumberPoint(event:MouseEvent):void
{output.appendText(".")
}