AS3和JS互相调用的小技巧 【一】
我对chm帮助手册小解：
选择“文件”>“新建”>“ActionScript 项目”菜单选项。
对于“项目名称”，提供主类的名称（例如：ExternalInterface）。
Flex Builder 将基于 ActionScript 项目模板创建一个 ActionScript 文件。擦除该文件中的所有默认模板内容。
将整个示例（包括包和 import 语句）粘贴到该 ActionScript 文件中。
package { import flash.display.Sprite; import flash.events.*; import flash.external.ExternalInterface; import flash.text.TextField; import flash.utils.Timer; import flash.text.TextFieldType; import flash.text.TextFieldAutoSize; public class ExternalInterfaceExample extends Sprite { private var input:TextField; private var output:TextField; private var sendBtn:Sprite; public function ExternalInterfaceExample() { input = new TextField(); input.type = TextFieldType.INPUT; input.background = true; input.border = true; input.width = 350; input.height = 18; addChild(input); sendBtn = new Sprite(); sendBtn.mouseEnabled = true; sendBtn.x = input.width + 10; sendBtn.graphics.beginFill(0xCCCCCC); sendBtn.graphics.drawRoundRect(0, 0, 80, 18, 10, 10); sendBtn.graphics.endFill(); sendBtn.addEventListener(MouseEvent.CLICK, clickHandler); addChild(sendBtn); output = new TextField(); output.y = 25; output.width = 450; output.height = 325; output.multiline = true; output.wordWrap = true; output.border = true; output.text = "Initializing...\n"; addChild(output); if (ExternalInterface.available) { try { output.appendText("Adding callback...\n"); ExternalInterface.addCallback("sendToActionScript", receivedFromJavaScript); if (checkJavaScriptReady()) { output.appendText("JavaScript is ready.\n"); } else { output.appendText("JavaScript is not ready, creating timer.\n"); var readyTimer:Timer = new Timer(100, 0); readyTimer.addEventListener(TimerEvent.TIMER, timerHandler); readyTimer.start(); } } catch (error:SecurityError) { output.appendText("A SecurityError occurred: " + error.message + "\n"); } catch (error:Error) { output.appendText("An Error occurred: " + error.message + "\n"); } } else { output.appendText("External interface is not available for this container."); } } private function receivedFromJavaScript(value:String):void { output.appendText("JavaScript says: " + value + "\n"); } private function checkJavaScriptReady():Boolean { var isReady:Boolean = ExternalInterface.call("isReady"); return isReady; } private function timerHandler(event:TimerEvent):void { output.appendText("Checking JavaScript status...\n"); var isReady:Boolean = checkJavaScriptReady(); if (isReady) { output.appendText("JavaScript is ready.\n"); Timer(event.target).stop(); } } private function clickHandler(event:MouseEvent):void { if (ExternalInterface.available) { ExternalInterface.call("sendToJavaScript", input.text); } } }}使用“运行”或“调试”命令测试示例。我们会在项目ExternalInterfaceExample/bin-debug/目录下找到相应的 ExternalInterfaceExample.swf.
为了测试前面的 ActionScript 代码，我们写一个HTML页面
<!-- saved from url=(0014)about:internet --> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>ExternalInterfaceExample</title> <script language="JavaScript"> var jsReady = false; function isReady() { return jsReady; } function pageInit() { jsReady = true; document.forms["form1"].output.value += "\n" + "JavaScript is ready.\n"; } function thisMovie(movieName) { if (navigator.appName.indexOf("Microsoft") != -1) { return window[movieName]; } else { return document[movieName]; } } function sendToActionScript(value) { thisMovie("ExternalInterfaceExample").sendToActionScript(value); } function sendToJavaScript(value) { document.forms["form1"].output.value += "ActionScript says: " + value + "\n"; } </script> </head> <body onload="pageInit();"> <object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" id="ExternalInterfaceExample" width="500" height="375" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab"> <param name="movie" value="ExternalInterfaceExample.swf" /> <param name="quality" value="high" /> <param name="bgcolor" value="#869ca7" /> <param name="allowScriptAccess" value="sameDomain" /> <embed src="ExternalInterfaceExample.swf" quality="high" bgcolor="#869ca7" width="500" height="375" name="ExternalInterfaceExample" align="middle" play="true" loop="false" quality="high" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"> </embed> </object> <form name="form1" onsubmit="return false;"> <input type="text" name="input" value="" /> <input type="button" value="Send" onclick="sendToActionScript(this.form.input.value);" /><br /> <textarea cols="60" rows="20" name="output" readonly="true">Initializing...</textarea> </form> </body> </html>将“ExternalInterfaceExample.swf”，和HTML页面放在同一目录下，运行页面，进行测试
小注：
这是HTML页面加载flash:
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" id="ExternalInterfaceExample" width="500" height="375" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab"> <param name="movie" value="ExternalInterfaceExample.swf" /> <param name="quality" value="high" /> <param name="bgcolor" value="#869ca7" /> <param name="allowScriptAccess" value="sameDomain" /> <embed src="ExternalInterfaceExample.swf" quality="high" bgcolor="#869ca7" width="500" height="375" name="ExternalInterfaceExample" align="middle" play="true" loop="false" quality="high" allowScriptAccess="sameDomain" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer"> </embed> </object>
这是AS3调用JS:
ExternalInterface.call("sendToJavaScript", input.text);