MACROMEDIA FLASH MX 2004 - ACTIONSCRIPT, Справочное руководство, Страница: 291 / 816

Boolean() 291
Boolean.valueOf()
Availability
Flash Player 5.
Usage
myBoolean .valueOf()
Parameters
None.
Returns
A Boolean value.
Description
Method; returns
true
if the primitive value type of the specified Boolean object is true,
false
if
it is false.
Example
var x:Boolean = new Boolean();
trace(x.valueOf());
// false
x = (6==3+3);
trace(x.valueOf());
// true
Boolean()
Availability
Flash Player 5; behavior changed in Flash Player 7.
Usage
Boolean( expression )
Parameters
expression
An expression to convert to a Boolean value.
Returns
A Boolean value or the value
expression
, as described below.
Description
Function; converts the parameter
expression
to a Boolean value and returns a value as follows:
If
expression
is a Boolean value, the return value is
expression
.
If
expression
is a number, the return value is
true
if the number is not zero, otherwise the
return value is
false
.
If
expression
is a string, the return value is as follows:
•
In files published for Flash Player 6 or earlier, the string is first converted to a number; the
value is
true
if the number is nonzero,
false
otherwise.
•
In files published for Flash Player 7 or later, the result is
true
if the string has a length greater
than zero; the value is
false
for an empty string.