操作脚本ExternalInterface.call()问题

Question

我正在使用以下AS代码调用一个javascript函数，该函数将返回所需的值。

package 
{
    import flash.display.Sprite;
    import flash.media.Camera;
    import flash.media.Video;
    import flash.display.BitmapData;
    import flash.display.Bitmap;
    import flash.events.MouseEvent;
    import flash.net.FileReference;
    import flash.utils.ByteArray;
    import com.adobe.images.JPGEncoder;
    import flash.external.ExternalInterface;
    public class Main extends Sprite
    {
        private var camera:Camera = Camera.getCamera();
        private var video:Video = new Video();
        private var bmd:BitmapData = new BitmapData(320,240);
        private var bmp:Bitmap;
        private var fileReference:FileReference = new FileReference();
        private var byteArray:ByteArray;
        private var jpg:JPGEncoder = new JPGEncoder();
        var id:int;


        public function Main():void
        {
            saveButton.visible = false;
            discardButton.visible = false;
            saveButton.addEventListener(MouseEvent.MOUSE_UP, saveImage);
            discardButton.addEventListener(MouseEvent.MOUSE_UP, discard);
            capture.addEventListener(MouseEvent.MOUSE_UP, captureImage);
            if (camera != null)
            {
                video.smoothing = true;
                video.attachCamera(camera);
                video.x = 140;
                video.y = 40;
                addChild(video);
            }
            else
            {
                trace("No Camera Detected");
            }
        }
        private function captureImage(e:MouseEvent):void
        {
            bmd.draw(video);
            bmp = new Bitmap(bmd);
            bmp.x = 140;
            bmp.y = 40;
            addChild(bmp);
            capture.visible = false;
            saveButton.visible = true;
            discardButton.visible = true;
        }
        private function saveImage(e:MouseEvent):void
        {
            byteArray = jpg.encode(bmd);
            id=ExternalInterface.call("getID()");
            fileReference.save(byteArray, id+".jpg");
            removeChild(bmp);
            saveButton.visible = false;
            discardButton.visible = false;
            capture.visible = true;
        }
        private function discard(e:MouseEvent):void
        {
            removeChild(bmp);
            saveButton.visible = false;
            discardButton.visible = false;
            capture.visible = true;
        }
    }
}

然而，当调用该函数时，它似乎向我返回了一个0。总是，，，，试图理解这个问题，但我想我无法理解。我试着提醒javascript函数返回的值，它是正确的，

function getID() {
    var idno = $('#ctl00_ContentPlaceHolder1_memberidcam').val();
    alert(idno);
    return idno;
}

请有人帮帮我。感谢

Answer 1

检查嵌入代码中的AllowScriptAccess参数。它影响是否允许swf通过ExternalInterface:与JS交互

http://helpx.adobe.com/flash/kb/control-access-scripts-host-web.html

此外，最佳做法是检查ExternalInterface是否可用：

http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/external/ExternalInterface.html#available

Answer 2

这可能是您从JavaScript返回的类型的问题。val（）方法可能只是返回一个字符串。

因此，请尝试更改JavaScript以将值转换为整数：

function getID() {
    var idno = $('#ctl00_ContentPlaceHolder1_memberidcam').val();
    return parseInt(idno);
}