StrCompôȽַģ

StrCompComp=0ʡԣĸСдComp=1ִСдȽϽ£
      ֵ        ȽϽ
        -1            S1<S2
         0            S1=S2
         1            S1>S2
        Null     S1=NullS2=Null

磺
StrComp("abcd","ABCD",1)==0
StrComp("abcd","ABCD")==1
StrComp("ABCD","abcd")==-1