在Flex的开发过程中，常常会遇到复制ArrayCollection的情况。以前只是从网上找个方法拿来就用，也没有具体的搞清楚所以然来。今天有时间，研究了一下，总结如下：
??????? Flex中的复制同java一样，也分为深复制和浅复制。（如果您对java的深复制和浅复制理解不深的话，可以参考我前一篇文章：JAVA中浅复制与深复制）
??????? 下面总结一下ArrayCollection的浅复制，共有4种方法：
??????? 1、var newArray:ListCollectionView=new ListCollectionView(ListCollectionView(oldArray).list);
??????? 2、var newArray:ArrayCollection=new ArrayCollection(oldArray.source);
??????? 3、var newArray:ArrayCollection=new ArrayCollection(oldArray.source.slice());
??????? 4、var newArray:ArrayCollection=new ArrayCollection(oldArray.toArray());
??????? 以上方法中，第一种方法由于不是创建的独立的ArrayCollection对象，所以不推荐使用。第二、三、四种方法相似，可以参考使用。
??????? 有的时候，我们也会用到深复制，方法如下：
??????? var newArray:ArrayCollection=ArrayCollection(this.clone(oldArray));
??????? this.clone()方法定义如下：
?????????function clone(source:Object):*
???????? {
??????????????? var myBA:ByteArray = new ByteArray();
??????????????? myBA.writeObject(source);
??????????????? myBA.position = 0;
??????????????? return(myBA.readObject());
???????? }
下面是我测试以上程序的Flex程序代码，大家可以参考：
<?xml?version="1.0"?encoding="utf-8"?>
<mx:Application?xmlns:mx="http://www.adobe.com/2006/mxml"?creationComplete="initApp()"?layout="absolute">
????<mx:Script>
????<![CDATA[
????????import?mx.collections.ArrayCollection;
????????import?mx.collections.ListCollectionView;
????????import?mx.controls.Alert;
????????import?flash.utils.ByteArray;
????????
????????
????????public?function?initApp():void
????????{????????????
????????}
????????
????????
????????//开始测试：
????????//浅复制1
????????private?function?test1():void
????????{
????????????//初始化需要的对象
????????????var?obj1:Object=new?Object();//定义对象obj1
????????????var?obj11:Object=new?Object();//定义对象obj1的引用对象obj11
????????????obj1.name="obj1.name";
????????????obj1.sub=obj11;//obj1的sub属性引用obj11
????????????obj11.name="obj11.name";????????????
????????????//实例化ArrayCollection对象，并将obj1添加进该对象
????????????var?oldArray:ArrayCollection=new?ArrayCollection();
????????????oldArray.addItem(obj1);
????????????
????????????//浅复制ArrayCollection
????????????var?newArray:ListCollectionView=new?ListCollectionView(ListCollectionView(oldArray).list);
????????????
????????????//修改obj11.name的值
????????????obj11.name="obj11.name?is?changed!";
????????????
????????????//输出复制前后的两个对象所引用的obj11对象的name属性值，如一致为浅复制，不一致为深复制
????????????Alert.show(oldArray.getItemAt(0).sub.name+"---"+newArray.getItemAt(0).sub.name);
????????}
????????//浅复制2
????????private?function?test2():void
????????{
????????????//初始化需要的对象
????????????var?obj1:Object=new?Object();//定义对象obj1
????????????var?obj11:Object=new?Object();//定义对象obj1的引用对象obj11
????????????obj1.name="obj1.name";
????????????obj1.sub=obj11;//obj1的sub属性引用obj11
????????????obj11.name="obj11.name";????????????
????????????//实例化ArrayCollection对象，并将obj1添加进该对象
????????????var?oldArray:ArrayCollection=new?ArrayCollection();
????????????oldArray.addItem(obj1);
????????????
????????????//浅复制ArrayCollection
????????????var?newArray:ArrayCollection=new?ArrayCollection(oldArray.source);
????????????
????????????//修改obj11.name的值
????????????obj11.name="obj11.name?is?changed!";
????????????
????????????//输出复制前后的两个对象所引用的obj11对象的name属性值，如一致为浅复制，不一致为深复制
????????????Alert.show(oldArray.getItemAt(0).sub.name+"---"+newArray.getItemAt(0).sub.name);
????????}
????????
????????//浅复制3
????????private?function?test3():void
????????{
????????????//初始化需要的对象
????????????var?obj1:Object=new?Object();//定义对象obj1
????????????var?obj11:Object=new?Object();//定义对象obj1的引用对象obj11
????????????obj1.name="obj1.name";
????????????obj1.sub=obj11;//obj1的sub属性引用obj11
????????????obj11.name="obj11.name";????????????
????????????//实例化ArrayCollection对象，并将obj1添加进该对象
????????????var?oldArray:ArrayCollection=new?ArrayCollection();
????????????oldArray.addItem(obj1);
????????????
????????????//浅复制ArrayCollection
????????????var?newArray:ArrayCollection=new?ArrayCollection(oldArray.source.slice());
????????????
????????????//修改obj11.name的值
????????????obj11.name="obj11.name?is?changed!";
????????????
????????????//输出复制前后的两个对象所引用的obj11对象的name属性值，如一致为浅复制，不一致为深复制
????????????Alert.show(oldArray.getItemAt(0).sub.name+"---"+newArray.getItemAt(0).sub.name);
????????}
????????
????????//浅复制4
????????private?function?test4():void
????????{
????????????//初始化需要的对象
????????????var?obj1:Object=new?Object();//定义对象obj1
????????????var?obj11:Object=new?Object();//定义对象obj1的引用对象obj11
????????????obj1.name="obj1.name";
????????????obj1.sub=obj11;//obj1的sub属性引用obj11
????????????obj11.name="obj11.name";????????????
????????????//实例化ArrayCollection对象，并将obj1添加进该对象
????????????var?oldArray:ArrayCollection=new?ArrayCollection();
????????????oldArray.addItem(obj1);
????????????
????????????//浅复制ArrayCollection
????????????var?newArray:ArrayCollection=new?ArrayCollection(oldArray.toArray());
????????????
????????????//修改obj11.name的值
????????????obj11.name="obj11.name?is?changed!";
????????????
????????????//输出复制前后的两个对象所引用的obj11对象的name属性值，如一致为浅复制，不一致为深复制
????????????Alert.show(oldArray.getItemAt(0).sub.name+"---"+newArray.getItemAt(0).sub.name);
????????}
????????
????????//深复制
????????private?function?test5():void
????????{
????????????//初始化需要的对象
????????????var?obj1:Object=new?Object();//定义对象obj1
????????????var?obj11:Object=new?Object();//定义对象obj1的引用对象obj11
????????????obj1.name="obj1.name";
????????????obj1.sub=obj11;//obj1的sub属性引用obj11
????????????obj11.name="obj11.name";????????????
????????????//实例化ArrayCollection对象，并将obj1添加进该对象
????????????var?oldArray:ArrayCollection=new?ArrayCollection();
????????????oldArray.addItem(obj1);
????????????
????????????//浅复制ArrayCollection
????????????var?newArray:ArrayCollection=ArrayCollection(this.clone(oldArray));
????????????
????????????//修改obj11.name的值
????????????obj11.name="obj11.name?is?changed!";
????????????
????????????//输出复制前后的两个对象所引用的obj11对象的name属性值，如一致为浅复制，不一致为深复制
????????????Alert.show(oldArray.getItemAt(0).sub.name+"---"+newArray.getItemAt(0).sub.name);
????????}
????????
????????//深复制调用的方法
????????function?clone(source:Object):*
????????{
????????????var?myBA:ByteArray?=?new?ByteArray();
????????????myBA.writeObject(source);
????????????myBA.position?=?0;
????????????return(myBA.readObject());
????????}
????]]>
????</mx:Script>
????<mx:Button?label="第一种浅复制方法"?click="test1()"?x="61"?y="36"/>
????<mx:Button?label="第二种浅复制方法"?click="test2()"?y="57"?x="61"?width="114"/>
????<mx:Button?label="第三种浅复制方法"?click="test3()"?y="78"?x="61"?width="114"/>
????<mx:Button?label="第四种浅复制方法"?click="test4()"?y="98"?x="61"?width="114"/>
????
????<mx:Button?label="深复制方法"?click="test5()"?y="147"?x="61"/>
</mx:Application>
