[Study Notes] as3 Quick Start notes

Author: fbysss
MSN: jameslastchina@hotmail.com
Blog: blog.csdn.net/fbysss
Disclaimer: This article is original from fbysss. for reprinting, please indicate the source

Keywords: as3, actionscript

Introduction:

If you have a basic knowledge of Java and JavaScript, The as syntax is easy to understand and there is a good morning. After reading this article, you can write code for debugging.

1. Development Tools

Flashbuilder. When you create a new [ActionScript] project, an as file is automatically generated and you can directly write code in it for testing.

In terms of structure, this file is a class, similar to the Java syntax.

 

2. As syntax

VaR keyword definition, Trace Output

Variable definition:

VaR I: Int = 100;

Trace ("I =" + I );

Array

VaR myarray: array = (1, 2, 3 );

Trace ("myarray [0] is:" + myarray [0]);

Object:

VaR person: Object =-{Name: "fbysss", Title: "manager", Gender: "male "};

Trace ("person. Name:" + person. Name );

 

Add Method

VaR person: Object =-

{Name: "fbysss", Title: "manager", Gender: "male ",

Sayhello: function (): void {

Trace ("Hello, I am" + person. Name); // trace ("Hello, I am" + person ["name"])

}

Salary: function (){

Return000000 )(;

}

};

 

Person. sayhello ();

Trace (person. Salary ());

 

 

Dynamically add class attributes and Methods

VaR person: Object = {};

Person. Name = "fbysss ";

Person. Title = "manager ";

Person. sayhello = function: void {

Trace ("Hello, I am" + person. Name );

}

 

Various types of default values

If Initialization is not performed,

Int, unit: 0

Number: Nan

String, object: NULL

Boolean: false

No type definition, such as var I; or var I: *;: Undefined

 

In keyword

VaR sssarray: array = {1, 2, 3 };

Trace ("2 in sssarray:" + (2 in sssarray); // true

Trace ("2 in sssarray:" + ("2" in sssarray); // true

 

Function Type

Function expression:

VaR sayhello: function = function (): void {

Trace ("helloworld ");

}

Sayhello ();

 

Obviously, sayhello can be called only after the statement is defined.

Normal Function Definition, consistent with JavaScript

 

Access parameter information

Similar to JavaScript. Is an arguments object

Arguments. length parameter count

Arguments. callee caller

 

 

Object-oriented

This part is similar to Java.

Package is not a semicolon, but curly brackets.

 

Event Mechanism

Differences between events and methods:

Events are triggered only when certain conditions are met. Passive calls

Methods may be called at any time; actively called

The caller and the called of the event may not be a process with low coupling.

Method calls must be in a process with strong coupling.

3. debugging method

F11

There is no main method. You can debug it through the constructor.

 

4. Notes

Number ("hello") output is Nan

But number ("hello") = Nan is always false

If you want to determine, you should use the IF (number ("hello") format, similar to Javascript

 

 

The switch statement is similar to JavaScript and supports the string type. Note break.

 

 

Q: dynamic parameters... rest? What is the purpose? -- There is a question here, because as3 and JavaScript directly support an indefinite number of parameters. What is the purpose?

A: In the object-oriented as3 class, it can be understood as a static language. This method must be used to support dynamic parameters (similar to Java's dynamic parameter practices ).

 

This parameter is not required for dynamically defined function variables.

 

Example:

 

Public class test (){

Publicfunction dynamicparam (){

For (vari = 0; I <Params. length; I ++ ){

Trace (Params [I]);

}

}

 

Publicfunction test (){

Dynamicparam (1, 2, 3 );

}

}