//for ..in     循环中的迭代变量包含属性所保存的值和名称            //for each..in 循环中的迭代变量只包含属性所保存的值，而不包含属性的名称                        //对象遍历，可以获取属性名称            private function testObject():void            {                var myObj:Object = {x:20, y:30};                //i:属性名称                for (var i:String in myObj)                {                    lab1.text+=i + ": " + myObj[i]+",";                }                                var myObj:Object = {x:20, y:30};                for each (var num in myObj)                {                    lab11.text+=num+",";                }            }                        //数组遍历，获取不到属性名称            private function testArray():void            {                //myArray[i]是对象，只能这样访问：myArray[i].x                var myArray:Array = [{x:20},{x:30}];                //i：数组的序号                for (var i:String in myArray)                {                    lab2.text+=i + ": " + myArray[i].x+",";                }                                //item     是对象，只能这样访问：item.x                var myArray:Array = [{x:20},{x:30}];                for each (var item in myArray)                {                    lab22.text+=item.x+",";                }            }