Flex3 Study Notes 3

Flex3 Study Notes 3

Flex script Basics

1) Method
The concept is simple, because the basic function is the method. The method is a function in the class. For example, you can register an event listener with applicationcomplete events. Add the following attributes to the application Tag:

1. Applicationcomplete = "fullnametextinput. setfocus ()"

2) Variable
A variable is a method for storing information in a program. For example:

1. VaR username;
2. Username = "Tom ";
3. VaR username = "Tom ";
4. Public var username = "Tom ";

3) Data Type
Basic data types include:
String string
Number value. The default value is Nan (not a number ")
Uint unsigned integer; default value: 0
Int integer. The default value is 0.
Boolean value. The default value is false.
Void is used as a special value of the function, indicating that no response is returned. The default value is undefined.
For example:

1. Public Function dosomemath (): number {
2. Return 2 + 2;
3. }

4) object
Everything is an object. ActionScript is an object-oriented language. To some extent, an object is a container. It has some attributes (states) and some operations (Actions) on the attributes ). As follows:

1. VaR car: Object = new object ();
2. Car. type = "sports car ";
3. Car. color = "red ";
4. Car. topspeed = 170;
5. Car. isinsured = false;
6. Car. Driver = undefined;
8. VaR person: Object = new object ();
9. Person. Name = "Steve ";
10. Person. Age = 19;
12. Car. Driver = person;

5) Class
The object is a class instance. If you have a car object and you want to create another car object, that is, you have to do the same thing. What should you do? The best way is to create a car class and instantiate it twice to generate two car objects respectively. For example:

1. Public class car {
2. VaR type: string;
3. VaR color: uint;
4. VaR topspeed: int;
5. VaR isinsured: Boolean;
6. VaR DRIVER: person;
7. }
8. Public class person {
9. VaR name: string;
10. VaR age: int;
11. }
13. VaR car: Car = new car ();
14. Car. type = "sports car ";
15. Car. Color = 0xff0000;
16. Car. topspeed = 170;
17. Car. isinsured = false;
18. Car. Driver = undefined;
20. VaR person: person = new person ();
21. Person. Name = "Steve ";
22. Person. Age = 19;
23. Car. Driver = person;

6) mxml and ActionScript
Mxml cannot replace ActionScript. mxml and ActionScript complement each other. Scripts are quite useful in terms of interactivity. In fact, mxml can be used to build a complete application only by using pure ActionScript. However, using mxml to create an application structure is the best method because it is easy to read and write.