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首先我这个示例是针对按钮来说的，其实其他的组件大致也都一样

第一种：直接写在click属性中
<s:Button label="click me" click="Alert.show('clicked!')"/> 

第二种：嵌入<s:click>标签
  <s:Button id="b" label="click me once">
            <s:click>
                b.enabled = false;
                mx.controls.Alert.show('clicked!');
            </s:click>
        </s:Button>
第三种：普通方法处理

  <fx:Script>
        <![CDATA[
            import mx.controls.Alert;
           
            private function handleClick(event:MouseEvent):void
            {
                b.enabled = false;
                mx.controls.Alert.show('clicked!');
            }
        ]]>
    </fx:Script>

第四种：添加事件监听器
 <s:Button id="b" label="click me once">
            <s:creationComplete>
                b.addEventListener(MouseEvent.CLICK, handleClick);
            </s:creationComplete>
        </s:Button>
  <fx:Script>
        <![CDATA[
            import mx.controls.Alert;
           
            private function handleClick(event:MouseEvent):void
            {
                b.enabled = false;
                mx.controls.Alert.show('clicked!');
            }
        ]]>
    </fx:Script>

最后把整个代码贴上

Xml代码  

1. <SPAN style="FONT-SIZE: medium"><?xml version="1.0" encoding="utf-8"?>  
2. <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"    
3.                xmlns:s="library://ns.adobe.com/flex/spark"    
4.                xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">  
5.     <fx:Script>  
6.         <![CDATA[  
7.             import mx.controls.Alert;  
8.               
9.             private function handleClick(event:MouseEvent):void  
10.             {  
11.                 Alert.show('HelloWorld','提示');   
12.             }  
13.         ]]>  
14.     </fx:Script>  
15.     <fx:Declarations>  
16.           
17.        
18.     </fx:Declarations>  
19.     <s:Button x="69" y="82" label="按钮" click="Alert.show('HelloWorld','提示');"/>  
20.     <s:Button  x="170" y="82" label="按钮">  
21.      <s:click>  
22.          <![CDATA[  
23.          Alert.show('HelloWorld','提示');   
24.          ]]>  
25.      </s:click>  
26.     </s:Button>  
27.     <s:Button  x="287" y="84" label="按钮"  click="handleClick(event)"/>  
28.     <s:Button x="403" y="83" label="按钮" id="c" >  
29.         <s:creationComplete>  
30.             c.addEventListener(MouseEvent.CLICK, handleClick);   
31.         </s:creationComplete>  
32.     </s:Button>  
33.        
34.        
35. </s:Application>  
36. </SPAN>