flash as3 一个输入文本框和多个按钮，点1按钮文本框显示1的内容，点2按钮换行显示2的内容，依次累积怎么写？
下面的只能显示一条
stage.addEventListener(MouseEvent.CLICK,onBtnClickHandler);
function onBtnClickHandler(e:MouseEvent):void{
switch(e.target.name){
case"btn1":
in_txt.text=String("000245452121");
break;
case"btn2":
in_txt.text=String("3551132115512");
break;
}
}

//比如有6个按钮，按钮实例名分别设置为btn0,btn1,btn2,btn3,btn4,btn5
for(var i:int=0;i<6;i++)
{
this["btn"+i].addEventListener(MouseEvent.CLICK,onBtnClickHandler);
}
function onBtnClickHandler(e:MouseEvent):void
{
switch(e.currentTarget.name)
{
case"btn0":
{
in_txt.text=String("000245452121 ");
break;
}
case"btn1":
{
in_txt.text=String("3551132115512");
break;
}
}
case"btn2":
{
in_txt.text=String("3551132115512");
break;
}
case"btn3":
{
in_txt.text=String("3551132115512");
break;
}
case"btn4":
{
in_txt.text=String("3551132115512");
break;
}
case"btn5":
{
in_txt.text=String("3551132115512");
break;
}
}