To prevent a class from being extended or a method from being overridden, we precede that class or method definition with the final attribute.
How it works?
To Final a class:
final public class A{
}
To Final a method:
public class A{
final public function A{
}
}
The final attribute is used for two reasons in ActionScript:
A recursive function is a function that calls itself. The following code shows a simple example of recursion.
function trouble(){
trouble();
}
A recursive function like above calls itself unconditionally, cause infinite recursion. To prevent this from happening, practical recursion functions call themselves only while a given condition is met.
Read the rest of this post »
A function can be assigned to a variable, passed to a function, or returned from a function, just like any other values.
For example, the following code defines a function, a() and then assigns it to the variable b. Notice that the parentheses operator, (), is omitted; if it were included, the code would simply assign a()’s return value to b.
function a(){
}
var b=a;
Once a function has been assigned to a variable, it can be invoked through that variable using the standard parentheses operator, (). For example, the following code invokes the function a() through the variable b:
b();
Three attributes are supported:
1.1 href: URL can be relativl or absolute. Notice: the absolute URL must begin with “http://”, otherwise, flash player will regard it as relative URL.
1.2 target: define the name of target loaded page, options: _self,_blank,_parent,_top;
_self means current window and current frame
_blank means open a new window
_parent means the parent of current frame;
_top menas the highest frame of the current frame;
1.3 bold tag <b></b> everything words between <b>xxx</b> will be bold;
Read the rest of this post »
