ExternalInterface类有两个公共属性：

1. available : Boolean　[static][read-only]　指示此播放器是否位于提供外部接口的容器中。
2. objectID : String　[static][read-only]　在 Internet Explorer 中，返回标签的 id 属性；在 Netscape 中，返回 name 属性。

同时具有两个公共方法：

1. addCallback(functionName:String, closure:Function):void　[static]　将 ActionScript 方法注册为可从容器调用。
2. call(functionName:String, … arguments):*　[static]　调用由 Flash Player 容器公开的函数，不传递参数或传递多个参数。

ActionScript调用JavaScript demo

AS:

import flash.events.MouseEvent;
import flash.external.ExternalInterface;
bt.addEventListener(MouseEvent.MOUSE_UP,alert);
function alert(e:MouseEvent):void{
 ExternalInterface.call("alert","a demo for call \n http://omiga.org");
}

直接调用即可,当然,最好检查一下当前容器是否支持外部接口通信。

bt.addEventListener(MouseEvent.MOUSE_UP,alert);
function alert(e:MouseEvent):void{
 if(ExternalInterface.available){
 ExternalInterface.call("alert","a demo for call \n http://omiga.org");
 }
}

JavaScript调用ActionScript demo

AS:

import flash.external.ExternalInterface;
function setText(s){
 i_txt.text = s;
}
ExternalInterface.addCallback("setText",setText);

HTML:

<object id="mySWF"  classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0" width="300" height="22">
 <param name="movie" value="addCallback.swf" />
 <param name="quality" value="high" />
 <param name="allowScriptAccess" value="always" />
 <embed src="addCallback.swf" quality="high" pluginspage="http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="300" height="22"></embed>
</object>
<button onclick="set()">设 置</button>
<script type="text/javascript">
function getFlash(id){
 if(document.all) return document.getElementById(id);
 else return document.getElementById(id).getElementsByTagName("embed")[0];
}
function set(){
 var s = prompt('请输入：');
 getFlash("mySWF").setText(s);
}
</script>

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Post tags: AS, AS3, EI, ExternalInterface, ExternalInterfaceas, flash, javascript