User Guide

998 ActionScript classes

__proto__ (Object.__proto__ property)

public __proto__ : Object

Refers to the prototype property of the class (ActionScript 2.0) or constructor function

(ActionScript 1.0) used to create the object. The

__proto__ property is automatically

assigned to all objects when they are created. The ActionScript interpreter uses the

__proto__

property to access the

prototype property of the object's class or constructor function to find

out what properties and methods the object inherits from its superclass.

Availability: ActionScript 1.0; Flash Player 5

Example

The following example creates a class named Shape and a subclass of Shape named Circle.

// Shape class defined in external file named Shape.as

class Shape {

function Shape() {}

}

// Circle class defined in external file named Circle.as

class Circle extends Shape{

function Circle() {}

}

The Circle class can be used to create two instances of Circle:

var oneCircle:Circle = new Circle();

var twoCircle:Circle = new Circle();

The following trace statements show that the __proto_ property of both instances refers to

the

prototype property of the Circle class.

trace(Circle.prototype == oneCircle.__proto__); // Output: true

trace(Circle.prototype == twoCircle.__proto__); // Output: true