MACROMEDIA FLASH MX 2004 - ACTIONSCRIPT, Справочное руководство, Страница: 228 / 816

228 Chapter 12: ActionScript Dictionary
Example
The pre-decrement form of the operator decrements
x
to 2 (
x - 1 = 2
), and returns the result
as
y
:
x = 3;
y = --x;
//y is equal to 2
The post-decrement form of the operator decrements
x
to 2 (
x - 1 = 2
), and returns the original
value of
x
as the result
y
:
x = 3;
y = x--
//y is equal to 3
++ (increment)
Availability
Flash Player 4.
Usage
++expression
exp+
Parameters
None.
Returns
A number.
Description
Operator (arithmetic); a pre-increment and post-increment unary operator that adds 1 to
expression
. The
expression
can be a variable, element in an array, or property of an object.
The pre-increment form of the operator (
++expression
) adds 1 to
expression
and returns the
result. The post-increment form of the operator (
exp+
) adds 1 to
expression
and
returns the initial value of
expression
(the value prior to the addition).
The pre-increment form of the operator increments
x
to 2 (
x + 1 = 2
), and returns the result
as
y
:
x = 1;
y = ++x
//y is equal to 2
The post-increment form of the operator increments
x
to 2 (
x + 1 = 2
), and returns the original
value of
x
as the result
y
:
x = 1;
y = x++;
//y is equal to 1