flash和js交互

Test.as:

package
{
import flash.display.Sprite;
import flash.external.ExternalInterface;

public class Test extends Sprite
{
public function hello(str:String):void{
ExternalInterface.call("back",str);
trace("hello "+str);
};
public function Test(){
trace("begin");
ExternalInterface.addCallback("callflash",hello);
}
}
}

Test.html body append:

<input type="button" value="click" onclick="callFalsh('shellar')"/> ? ? ? ? <script> ? ? ? ? function thisMovie(movieName) { ? ?if (navigator.appName.indexOf("Microsoft") != -1) { ? ? ? ? return window[movieName]; ? ?} else { ? ? ?? return document[movieName]; ? ?} }; function callFalsh(value) { ? ? thisMovie("Test").callflash(value); }; function back(str){ alert("i am back "+str); } ? ? ? ? ? ? ? ? </script>?