Цитата:
null constant
A special value that can be assigned to variables or returned by a function if no data was provided. You can use null to represent values that are missing or that do not have a defined data type.
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Цитата:
undefined constant
A special value, usually used to indicate that a variable has not yet been assigned a value. A reference to an undefined value returns the special value undefined. The ActionScript code typeof(undefined) returns the string "undefined". The only value of type undefined is undefined.
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Цитата:
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The value undefined is similar to the special value null. When null and undefined are compared with the equality (==) operator, they compare as equal. However, when null and undefined are compared with the strict equality (===) operator, they compare as not equal.
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