flex中textarea事件

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import flash.text.TextField;
import flash.events.TextEvent;
import flash.text.TextFieldAutoSize;


var txt:TextField = new TextField();
this.addChild(txt);

txt.htmlText = "关于本站 | 广告服务";
txt.autoSize = TextFieldAutoSize.LEFT;
txt.addEventListener(TextEvent.LINK,th)
function th($evt:TextEvent):void
{
        if($evt.text == "关于本站")
        {
                trace("关于本站");
        }
        else if($evt.text == "广告服务")
        {
                trace("广告服务");
        }
}