Flex获取url参数异常（Error #2060）

 1 private function getParameter(name:String):String{
 2                 if (ExternalInterface.available) {
 3                     try{
 4                         var query:String = ExternalInterface.call("window.location.search.substring", 1);
 5                         var pairs:Array = query.split("&");
 6                         for(var i:uint=0; i < pairs.length; i++) {
 7                             var pos:int = pairs[i].indexOf("=");
 8                             if(pos != -1) {
 9                                 var pname:String = pairs[i].substring(0, pos);
10                                 if(pname == name){
11                                     var value:String = pairs[i].substring(pos+1);13                                     return value;
14                                 }
15                             }
16                         }
17                     }catch (error:Error) { 
18                         Alert.show("An Error occurred: " + error.message + "\n"); 
19                     } 
20                 }
21                 return null;
22             }