急：如何得到这样的字符串？

[Cybernet]

a,b都是数字字符组成的，带"，"号分割的字符串，比如：
a="1,2,3,4,5,10,20,30,40,50"
b="1,3,5,10,30,50"

我想得到字符串c是：b在a中出现的，就删除，
相当于：c=a-b
既c="2,4,20,40"

ASP中如何做呀，谢谢！

[peijunfeng]

ubound加split函数将a和b分割为两个数组，例如得到数组aArr和bArr，然后比较，赋值给cArr
简要如下：
for i=0 to ubound(aArr)
iflag=0
for j=0 to ubound(bArr)
if aArr(i)=bArr(j) then
iflag=1
end if
next
if iflag<>1 then
cArr=cArr& aArr(i) & ","
end if
next

你可以在此基础上修改，希望对你有帮助

[hnfz123]

数组解决，数组的的差

[devillicheng]

同意 peijunfeng(爱缕缕)
在完善一下
<%
a="1,2,3,4,5,10,20,30,40,50"
b="1,3,5,10,30,50"
aArr = Split(a,",")
bArr = Split(b,",")
Dim Flag

For i = 0 To Ubound(aArr)
For j = 0 To Ubound(bArr)
Flag = True
'Response.Write bArr(i) & " " & aArr(j) & "<br>"
If bArr(j) = aArr(i) Then
Flag = False
Exit For
End If
Next
If Flag Then
c = c & aArr(i) & ","
End If
Next
c = Mid(c,1,Len(c)-1)
Response.Write c
%>