问题
I want your thoughts on why or (why not) this statement should (or should not) be used.
Since this is a little subjective, here is my criteria: Upvotes given for concrete reasons (as opposed to unreasoned opinion). Final answer accepted will be the most comprehensive answer.
回答1:
In a well-crafted program, Defxxx statements are pointless, because all variables and functions will be explicitly typed.
Except for one case: DefObj A-Z, in conjunction with Option Explicit, makes it (practically) impossible for any untyped or undeclared variable, function, or member to exist in your code, and makes anything that would wind up as a Variant stand out in sharp relief.
DefObj A-Z is the suspenders to Option Explicit's belt.
来源：https://stackoverflow.com/questions/1904884/are-deftype-statments-considered-bad-practice