How to convert AS2 and AS3 variables in Flex3
Xiaobian to share with you how to convert AS2 and AS3 variables in Flex3, I believe most people still do not know how to, so share this article for your reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!
Flex3 Tutorial AS2 and AS3 Variable Conversion
Conversion of variables
Similar to the changes in classes and methods, the protected,internal modifier has also been added to variables, which has the same effect as the same name modification of classes and methods, so it will not be repeated here. The final keyword cannot be used to modify variables, unlike Java, but instead a const keyword instead of var is used to identify constants, such as constN:int=100; similar to C/C++.
Another change is that AS3 introduces a new type *, * stands for arbitrary type (i.e. no type checking), although in AS3, variables and method return types can also be set undeclared, but FlexBuilder will warn, because AS3 is more static than AS2, so it is not recommended to omit type declaration, if you really need to do no type checking, then use *, such as vardynamicProperty:*;dynamicProperty will be assigned any type of value, functionmethod():* will be able to return any type of value.
◆ Another important point is that the initial values of variables in Flex3 tutorial are different from AS2, which should be careful when converting. For AS2, variables are equal to undefined before assignment, while in AS3, the initial values of different types are as follows:
Datatype
Defaultvalue
Boolean
false
int
0
Number
NaN
Object
null
String
null
uint
0
◆Flex3 tutorial does not declare the type (equivalent to * type)
undefined
Other types include user-defined classes.
null
Therefore, be careful here, int,Number,uint,Boolean and other variables will not have null or undefined values.
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