<?xml version="1.0" encoding="utf-8"?><!-- Simple example to demonstrate the Halo DataGrid control. --><s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"               xmlns:s="library://ns.adobe.com/flex/spark"               xmlns:mx="library://ns.adobe.com/flex/mx">                    <fx:Script>            <![CDATA[                                import mx.collections.ArrayCollection;                                //添加对象                public function insertCollection():void{                    //方法1                    //一个花括号代表一个对象                    var selectType01:String = "东京";                    var selectType02:String = "横滨";                    var oneArrayCollection:ArrayCollection = new ArrayCollection([{label:selectType01, data:1}, {label:selectType02, data:2}]);                                        //方法2                    var twoArrayCollection:ArrayCollection;                    var array:Array = new Array();                    for(var i:Number = 0; i < 10; i++){                        array.unshift({city:"B" + i, data:i, size:1000 + i});                    }                    twoArrayCollection = new ArrayCollection(array);    //长度为10，也就是有10个对象                                        //方法3                    var threeArrayCollection:ArrayCollection = new ArrayCollection();                    for(var j:Number = 0; j < 5; j++){    //添加5个对象                        threeArrayCollection.addItem({name:"C" + j, sequence:j, ok:"hello" + j});                    }                    trace(threeArrayCollection[2].ok);    //hello2                                        //方法4，在指定的索引处添加对象                    threeArrayCollection.addItemAt({name:"K", sequence:"A", ok:"H"},2);                    trace(threeArrayCollection[2].ok);    //H                                        //方法5，在制定的索引处添加对象                    threeArrayCollection.setItemAt({name:"W", sequence:"X", ok:"Q"}, 5);                    trace(threeArrayCollection[5].sequence);    //X                }                                //删除对象，ArrayCollection相当于数组（数组集合）                public function deleteCollection():void{                    var delCollection:ArrayCollection = new ArrayCollection();                    for(var j:Number = 0; j < 5; j++){    //添加5个对象                        delCollection.addItem({name:"DEL" + j, sequence:j, ok:"hello" + j});                    }                    for(var value:String in delCollection){                        trace(delCollection[value].ok);                    }                    delCollection.removeItemAt(2);    //删除第三个元素                    for(var value2:String in delCollection){                        trace(delCollection[value2].ok);                    }                    delCollection.removeAll();    //全部删除                    for(var value3:String in delCollection){                        trace("=========");                        trace(delCollection[value3].ok);                    }                }                                //查询对象                public function selectCollection():void{                    var twoArrayCollection:ArrayCollection;                    var array:Array = new Array();                    for(var i:Number = 0; i < 10; i++){                        array.unshift({city:"B" + i, data:i, size:1000 + i});                    }                    twoArrayCollection = new ArrayCollection(array);    //ArrayCollection的构造方法有参数的话则一定是Array对象作为参数                    if(twoArrayCollection.contains(array[1])){                        var objIndex:int = twoArrayCollection.getItemIndex(array[1]);    //返回该项目的索引                        trace(objIndex);                    }                    //        trace("OK");                    //     }                }                                            ]]>        </fx:Script>                <mx:Button id="insertID" x="320" label="添加对象" click="insertCollection();"/>        <mx:Button id="deleteID" x="450" label="删除对象" click="deleteCollection();"/>        <mx:Button id="seleteID" x="600" label="查询对象" click="selectCollection();"/>                <fx:Declarations>            <!-- Place non-visual elements (e.g., services, value objects) here -->        </fx:Declarations>            </s:Application>