 Boolean ֵָǷѳʼ

IsEmpty(expression)
expression ʽȻ IsEmpty жһǷѳʼ expression һ

˵
δʼʽΪ Empty IsEmpty  True False expression һϵıܷ False

ʾ IsEmpty Ƿܱʼ

Dim MyVar, MyCheck
MyCheck = IsEmpty(MyVar)   '  True
MyVar = Null   ' Ϊ Null
MyCheck = IsEmpty(MyVar)   '  False
MyVar = Empty   ' Ϊ Empty
MyCheck = IsEmpty(MyVar)   '  True
Ҫ
汾 1

