as3 用一个按钮控制元件是否可见

jiantou.visible = false;
var jianboolean:Boolean = true;
jian_btn.addEventListener (MouseEvent.CLICK, jianfunc);
function jianfunc (event:MouseEvent):void
{
	if (jianboolean == true)
	{
		jiantou.visible = true;
		jianboolean = false;
		trace ("true显示按钮");
	} else
	{
		jiantou.visible = false;
		jianboolean = true;
		trace ("false关闭按钮");
	}
}