使用MXML 将监听器与事件相关联

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:Script>
        <![CDATA[
            public function convertCurrency():void {
                var rate:Number = 120;
                var price:Number = Number(txtPrice.text);
                if (isNaN(price)) {
                    lblResults.text = "Please enter a valid price.";
                } else {
                    price = price * rate;
                    lblResults.text = "Price in Yen: " + String(price);
                }
            }
        ]]>
    </mx:Script>
    <mx:Panel x="10" y="10" width="410" height="200" layout="absolute">
        <mx:Label x="10" y="10" text="请输入美元" width="76"/>
        <mx:Text y="10" id="txtPrice" height="20" text="10" enabled="true" width="149" x="81"/>
        <mx:Button x="252" y="8" id="cmdConvert" label="转换" click="convertCurrency()"/>
        <mx:Label x="10" y="59" id="lblResults" width="228" text="轮换后"/>
    </mx:Panel>
    
</mx:Application>