首先下载flex-iframe.swc,并添加到libs中
下面直接上代码 
复制代码 代码如下:
 
<?xml version="1.0" encoding="utf-8"?> 
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
xmlns:s="library://ns.adobe.com/flex/spark" 
xmlns:mx="library://ns.adobe.com/flex/mx" 
xmlns:code="http://code.google.com/p/flex-iframe/" 
minWidth="955" minHeight="600" 
creationComplete="application1_creationCompleteHandler(event)"> 
<fx:Script> 
<![CDATA[ 
import mx.events.FlexEvent; 
protected function application1_creationCompleteHandler(event:FlexEvent):void 
{ 
this.myiframe.source = "http://m.weather.com.cn/m/pn11/weather.htm"; 
} 
]]> 
</fx:Script> 
<fx:Declarations> 
<!-- 将非可视元素(例如服务、值对象)放在此处 --> 
</fx:Declarations> 
<code:IFrame/> 
</s:Application>