as3中经过ByteArray进行对象的深度拷贝

2012-10-10

as3中通过ByteArray进行对象的深度拷贝今天同事问我有as3中对象深度拷贝的问题原来还真是没用过，今天googl

as3中通过ByteArray进行对象的深度拷贝

今天同事问我有as3中对象深度拷贝的问题

原来还真是没用过，今天google后自己总结下,便于大家参考

as3中通过ByteArray可以进行对象的深度拷贝

import flash.utils.ByteArray;import flash.utils.getQualifiedClassName;import flash.net.*;import src.*;function cloneObject(source:Object) :* {var typeName:String = getQualifiedClassName(source);//获取全名trace(”输出类的结构”+typeName);//return;var packageName:String = typeName.split(”::”)[0];//切出包名trace(”类的名称”+packageName);var type:Class = getDefinitionByName(typeName) as Class;//获取Classtrace(type);registerClassAlias(packageName, type);//注册Class//复制对象var copier:ByteArray = new ByteArray();copier.writeObject(source);copier.position = 0;return copier.readObject();}

有的人说用复制对象那一段不就可以了吗，但是实际上行不通
对于数组深度复制来说，复制对象的后面4句代码就足够了

var a1:Array=[1,2,3];var a2:Array =cloneObject(a1);var a3:Array = a1;a1.push(”youmila”);trace(”a1:”+a1+”a2:”+a2+”a3″+a3);

但是对于对象来说肯定不行

用列子测试下
src.youmila.as 代码：

package src{public class youmila{private var $_name:String =”youmila”;private var $_num:Number =0;public function youmila():void{trace($_name);}public function secondFunc():void{$_num++;trace(”this a called function $_num::”+$_num);}}}

yapollo.as 代码：

package {public class yapollo{private var $_name:String =”yapollo”;public var $_num:Number =0;public function yapollo():void{trace($_name);}public function secondFunc():void{$_num++;trace(”this a called function $_num::”+$_num);}}}

测试实例

var uml1:youmila = new youmila();
var uml2 = cloneObject(uml1);
trace(”类型”+getQualifiedClassName(uml2));?
输出结果：

youmila
类型Object?
原来的对象类型丢失了，所以对于对象而言，四行不够，必须
用registerClassAlias来保存类的别名，以用于丢失后恢复类的类型
测试实例

var uml1:youmila = new youmila();var uml2 = cloneObject(uml1);trace(”类型”+getQualifiedClassName(uml2));var apollo:yapollo = new yapollo();apollo.secondFunc();var apollo2 = cloneObject(apollo);trace(”第一次输出复制对象的$_num值”+apollo2.$_num);trace(”类型”+getQualifiedClassName(apollo2));apollo2.secondFunc();trace(”第二次输出复制对象的$_num值”+apollo2.$_num);

输出结果：

youmila
输出类的结构src::youmila
类的名称src
[class youmila]
youmila
类型src::youmila
yapollo
this a called function $_num::1
输出类的结构yapollo
类的名称yapollo
[class yapollo]
yapollo
第一次输出复制对象的$_num值1
类型yapollo
this a called function $_num::2
第二次输出复制对象的$_num值2?

热点排行

编程

as3中经过ByteArray进行对象的深度拷贝