Flex3/ActionScript3.0中eval的替代方案

AS3中没有eval，但可以像这样调用：

this["your_function_name"]();

请看例子：

private function playTrack(location:String):void {

 var dot_position:Number = location.lastIndexOf('.');
 var file_ext:String = location.substr(dot_position+1);
 
 var play_function_name:String = file_ext+"_player";
 if (this.hasOwnProperty(play_function_name)) {
  this[play_function_name]();
 }else {
  Alert.show("Do not support this file extension("+file_ext+").");
 }
 
}

参考：http://livedocs.adobe.com/flex/3/html/help.html?content=ProgrammingHTMLAndJavaScript_03.html