⣺һһѧϵ4_жϣif
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ڣ2008.11.14
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ifжϣΣ

1жļļǷڣ if exist 䣻
2жĳַǷȣ if "ַ1"=="ַ2" 䣻
3жĳֵǷȣ if ֵ1 equ ֵ2 䣻
4жĳǷѾֵ if defined str 䣻

ifʽģif ʽ (1) else (2)ĺǣʽôִ1򣬽ִ2

ΣԷֱʹ´룺

1if exist d:\test.txt (echo Dtest.txt) else (echo D²test.txt)
2if "abc"=="xyz" (echo ַabcַxyz) else (echo ַabcַxyz)
3if 1 equ 2 (echo 12) else (echo 12)
4if defined str (echo strѾֵֵΪ%str%) else (echo strֵΪ)

жַǷȵʱifִСд磬ifΪַabcַAbcִͬСдҪ /i أʹ if /i "ַ1"=="ַ2" ĸʽ⣬ڷ"=="ǵ"="

жֵ֮ĴСϵ˵equ֮⣬ĹϵţifĹϵż±

ĺ	ϵ	ӢĽ

		equ	equal
		gtr	greater than
ڻ	geq	greater than or equal
С		lss	less than
Сڻ	leq	less than or equal
		neq	no equal

if仹һʽif ʽ 䣬ĺǣʽִ䣬ʲôҲ