asp判断字段为空与不为空

Question

表里有字段1和字段2
如果字段1不为空输出“1”
如果字段2不为空输出“2”
如果字段1和2都不为空输出“3”
如果字段1和2都为空输出“0”
========================================
if 字段1<>"" and 字段2<>"" then
response.Write"3"
else if 字段1<>"" then
response.Write"1"
else if 字段2<>"" then
response.Write"2"
else if 字段1="" and 字段2="" then
response.Write"0"
end if
end if
end if
end if
================================
我这样写输出有错误，谁给我个正解

Answer 1

If (条件1) then
ElseIf(条件2) then
……
ElseIf(条件n) then
Else
End If

所以改一下就可以了

If (字段1<>"") and (字段2<>"") Then
Response.write 3
ElseIf (字段1="") and (字段2="") Then
Response.write 0
ElseIf 字段<>"" then
Response.write 1
Else
Response.write 2
End if

另外判断字符串是否为空，不建议用字符去比较，这样效率比较低，可以用len去比较:
If Len(字段1) = 0 Then MsgBox "字段1为空"

Answer 2

-------------------------------------
if 字段1<>"" then
response.Write"1"
end if

if 字段2<>"" then
response.Write"2"
end if

if 字段1<>"" and 字段2<>"" then
response.write "3"
end if

if 字段1="" and 字段2="" then
response.write "3"
end if
___________________________________________

还可以这样

if 字段1<>"" then
response.Write"1"

elseif 字段2<>"" then
response.Write"2"

elseif 字段1<>"" and 字段2<>"" then
response.write "3"

elseif 字段1="" and 字段2="" then
response.write "3"

end if

Answer 3

语法写错了吧

if 字段1<>"" and 字段2<>"" then
response.Write "3"
elseif 字段1="" and 字段2="" then
response.Write "0"
elseif 字段1<>"" then
response.Write "1"
elseif 字段2<>"" then
response.Write "2"
end if