文本框里文字悬浮触发事件

import flash.text.TextField;
import flash.text.TextFieldAutoSize;
//指示灯
var alterSprite:Sprite = new Sprite();
alterSprite.x = 100;
alterSprite.y = 100;
addChild(alterSprite);

//文本段
var txt:TextField = new TextField();
txt.autoSize = TextFieldAutoSize.LEFT;	//规范文本高度宽度
txt.htmlText = "11222222222\n11111<a href='event:test'>2222</a>11111<a href='event:test1'>2222</a>11111";
addChild(txt);
txt.addEventListener(MouseEvent.MOUSE_MOVE, moveHandle);
txt.addEventListener(MouseEvent.MOUSE_OUT, outHandle);

var oldStr:String = '';
function moveHandle(e:MouseEvent):void{
var indexNum:int = txt.getCharIndexAtPoint(txt.mouseX, txt.mouseY);
var txtFormat:TextFormat = txt.getTextFormat(indexNum);
var lsStr:String = txtFormat.url;
if (lsStr != "" && lsStr != null )	{
drawCircle(0xff0000);
}else{
outHandle(null);
}
}

function outHandle(e:MouseEvent):void{
drawCircle(0xffff00);
}

function drawCircle(color:uint):void{
alterSprite.graphics.clear();
alterSprite.graphics.beginFill(color);
alterSprite.graphics.drawCircle(0,0,50);
alterSprite.graphics.endFill();
}