用方括号代替引号:

IF [%1] == [] GOTO MyLabel

圆括号是不安全的:只能使用方括号。

使用!而不是“空字符串检查”

@echo off
SET a=
SET b=Hello
IF !%a%! == !! echo String a is empty
IF !%b%! == !! echo String b is empty

你可以使用

if defined (variable) echo That's defined!
if not defined (variable) echo Nope. Undefined.

使用“IF DEFINED变量命令”测试批处理文件中的变量。

但如果您想测试批处理参数，请尝试以下代码以避免棘手的输入(如“1 2”或ab^>cd)

set tmp="%1"
if "%tmp:"=.%"==".." (
    echo empty
) else (
    echo not empty
)

This way looks correct:

if "%~1" == "" if [%1] == [] echo Argument 1 is really empty.

First filter (if "%~1" == "") из safe way to detect argument is empty or "".
Second filter (if [%1] == []) will skip "" argument.
Remember we have two kind of empty arguments : really empty (nothing) and empty quotes "".
We have to detect both.

Next code takes all arguments "as is" in variable args:

:GetArgs
set args=%1
:ParseArgs
shift /1
if "%~1" == "" if [%1] == [] goto :DoneArgs
set args=%args% %1
goto :ParseArgs
:DoneArgs
if not defined args echo No arguments
if defined args echo Aguments are: %args%

This code correctly process "normal" arguments (simple words, "multiword phrases" or "") with balanced quotes.
Quoted arguments can even contain special chars like "a & b".
But it is still can fail with "abnormal" expressions with unbalanced quotes (do not use them).

我通常用这个:

IF "%1."=="." GOTO MyLabel

如果%1为空，If将比较"."和"."，结果为真。