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Chapter 5: ActionScript Core Language Elements
var
Availability
Flash Player 5.
Usage
var
variableName
[=
value1
]
[...,
variableNameN
[=
valueN
]]
Parameters
variableName
An
identifier.
value
The value assigned to the variable.
Returns
Nothing.
Description
Statement; used to declare local variables.
If you declare variables inside a function, the variables are local. They are defined for the function
and expire at the end of the function call. More specifically, a variable defined using
var
is local to
the code block containing it. Code blocks are demarcated by curly braces ({}).
You cannot declare a variable scoped to another object as a local variable (for more information,
see
“Scoping and declaring variables” on page 28
):
my_array.length = 25; // ok
var my_array.length = 25; // syntax error
When you use
var
, you can strictly type the variable. For more information, see
“Strict data
typing” on page 24
.
Note:
You must also use
var
when declaring properties inside class definitions in external scripts.
Class files also support public, private, and static variable scopes. See
“Creating Custom Classes with
ActionScript 2.0” on page 45
, and see
private
,
public
,
and
static
.
Example
The following ActionScript creates a new array of product names.
Array.push
adds an element
onto the end of the array. If you want to use strict typing, it is essential that you use the
var
keyword. Without
var
before
product_array
, you get errors when you try to use strict typing.
var product_array:Array = new Array("MX 2004", "Studio", "Dreamweaver",
"Flash", "ColdFusion", "Contribute", "Breeze");
product_array.push("Flex");
trace(product_array);
// output: MX 2004,Studio,Dreamweaver,Flash,ColdFusion,Contribute,Breeze,Flex
CHAPTER 5
ActionScript Core Language Elements
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Страница 1: ...Flex ActionScript Language Reference...
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Страница 66: ...66 Chapter 2 Creating Custom Classes with ActionScript 2 0...
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Страница 133: ...break 133 See also for for in do while while switch case continue throw try catch finally...
Страница 135: ...case 135 See also break default strict equality switch...
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Страница 229: ...while 229 i 3 The following result is written to the log file 0 3 6 9 12 15 18 See also do while continue for for in...
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Страница 815: ...Other keys 815 Num Lock 144 186 187 _ 189 191 192 219 220 221 222 Key Key code...
Страница 816: ...816 Appendix B Keyboard Keys and Key Code Values...
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