1910/090
AS3-对象的深度复制
内容转载自：http://blog.youmila.com/?p=241
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Class
trace(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
这下满足需求了吧～