how to call actionscript function from javascript

I have a function like this in actionscript3

private function uploadFile(event:MouseEvent):void {
       开发者_JAVA技巧     var uploader:URLRequest = new URLRequest(serverUploadFile);
            localFile.upload(uploader);
        }

how can i call this function from javascript ?

thx

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In AS3 Use ExternalInterface to add a javascript callback.

ExternalInterface.addCallback("uploadFile", null, uploadFile);

More details here

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Use ExternalInterface