Flex 与 JavaScript 交互，主要依靠Flex的ExternalInterface，其提供了addCallBack和call方法.

下面的例子将演示Flex调用javascript，和javascript调用Flex

js 代码

1. function hello(param) {
2. alert(param);
3. return "jsp Hello:" + param;
4. }
6. function callFlexFunction() {
7. var x = document.getElementById("flexObject").flexHelloWorld("Hello", "world");
8. alert(x);
9. }

Flex 代码

1. <?xml version="1.0" encoding="utf-8"?>
2. <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
3. initialize="initApp()">
5. <mx:Script>
6. <![CDATA
7. import mx.controls.Alert;
9. public function flexHelloWorld(param1:String, param2:String):String {
10. Alert.show("param1: " + param1 + "; param2:" + param2);
11. return "Hello " + param1 + param2;
12. }
14. public function initApp():void {
15. ExternalInterface.addCallback("flexHelloWorld", flexHelloWorld);
16. }
18. public function jspHello():void {
19. var s:String = ExternalInterface.call("hello", "Flex");
20. Alert.show(s);
21. }
23. ]]>
24. </mx:Script>
26. <mx:Button x="52" y="58" label="call javascript" click="jspHello()"/>
28. </mx:Application>