Prototype objects in actionscript3

AS3mso-ascii-font-family: calibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:
; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family: calibri;
MSO-Hansi-theme-Font: minor-Latin "> and javamso-Fareast-font-family:; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family:
Calibri; MSO-Hansi-theme-Font: minor-Latin "> different languages, in which everything is an object, even a class is an object, all classes, including any classes we define. Their prototype objects are objectmso-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> class.

MSO-Fareast-font-family:; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family:
Calibri; MSO-Hansi-theme-Font: minor-Latin "> first, we use a simple example to describe prototypemso-Fareast-font-family:; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family:
Calibri; MSO-Hansi-theme-Font: minor-Latin "> have a perceptual and intuitive understanding. Prototypemso-Fareast-font-family:; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family:
Calibri; MSO-Hansi-theme-Font: minor-Latin "> is a static attribute in a class, which indicates reference to the class's prototype object.

MSO-ascii-font-family: calibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:
; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family: calibri;
MSO-Hansi-theme-Font: minor-Latin "> let's first define two classes that satisfy the inheritance relationship:

Public dynamic class parentclass {}
Public dynamic class childclass extends parentclass {
}

Then we write in the script:

Trace (parentclass. prototype, childclass. Prototype );

MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> result output:

[Object object] [object]

MSO-ascii-font-family: calibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:
; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family: calibri;
MSO-Hansi-theme-Font: minor-Latin "> the result [object]
Minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font: minor-Fareast;
MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin ">, we can see that the first object calibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> indicates an object, the second objectmso-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> stands for objectmso-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> class, which means that this is an object, he is objectmso-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> class.

MSO-ascii-font-family: calibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:
; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family: calibri;
MSO-Hansi-theme-Font: minor-Latin "> WE can dynamically add attributes to the prototype object and add them to the prototypecalibri of the parent class; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Attributes added in minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> can be shared by the quilt class, the following example shows how to use prototypecalibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> adds a sayhellocalibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> function. Then we can access it in the subclass. In contrast, if we are in prototypecalibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin ">, other sub-classes cannot be accessed. That is, you can only use this class to call the attributes added to the prototype.

Public class parentclass
{
Prototype. sayhello = function (): String
{
Return "Hello, ptototype ";
}
}
Public class childone extends parentclass
{
}
Public class childtwo extends parentclass
{
}

Public Function oncreate (): void
{
VaR strinfo: String = childone. Prototype. sayhello ();
Trace (strinfo );
VaR str1: String = childtwo. Prototype. sayhello ();
Trace (str1 );
Childone. Prototype. testfunc = function (): void
{
Trace ("just for test .");
}
Childone. Prototype. Test ();
// Childtwo. Prototype. Test ();
}

MSO-ascii-font-family: calibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:
; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family: calibri;
MSO-Hansi-theme-Font: minor-Latin "> the class instance differs from the class in terms of prototype objects. The initial prototype objects of a class instance are undefined, neither o bjectcalibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> classes are not the classes that define this instance either. That is to say, when we instantiate a class, the prototype object of this instance is undefined.

MSO-ascii-font-family: calibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:
; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family: calibri;
MSO-Hansi-theme-Font: minor-Latin "> we have defined childonemso-Fareast-font-family:; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family:
Calibri; MSO-Hansi-theme-Font: minor-Latin "> class for instantiation:

VaR C1: childone = new childone ();
Trace (c1.prototype );

Test output:

Undefined

MSO-ascii-font-family: calibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:
; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family: calibri;
MSO-Hansi-theme-Font: minor-Latin "> however, We can dynamically assign values to the prototype attribute of an instance, provided that the class must be a dynamic class. The Code is as follows:

VaR C1: childone = new childone ();

C1.prototype = childtwo;
Trace (c1.prototype );

Test output:

[Class childtwo]

MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> This indicates that its prototype object is a class,
Minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font: minor-Fareast;
MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin "> Class Name: childtwocalibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:; MSO-Fareast-theme-Font:
Minor-Fareast; MSO-Hansi-font-family: calibri; MSO-Hansi-theme-Font: minor-Latin ">.

MSO-ascii-font-family: calibri; MSO-ascii-theme-Font: minor-Latin; MSO-Fareast-font-family:
; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family: calibri;
MSO-Hansi-theme-Font: minor-Latin "> at last, I want to add some knowledge about namespaces. MSO-Fareast-font-family:; MSO-Fareast-theme-Font: minor-Fareast; MSO-Hansi-font-family:
Calibri; MSO-Hansi-theme-Font: minor-Latin "> Functions, variables, and constants can be placed in a namespace, but class definitions cannot be placed. The following is an example of a simple namespace:

Public namespace MySpace = "http://phinecos.cnblogs.com ";

MySpace function myfunc (): void
{
Trace ("test namespace .");
}

Use namespace MySpace;
Myfunc ();
MySpace: myfunc ();