ASP判断语句应该怎么写

条件不多时用：
<%
if a=0 then
response.write "<img src=""1.jpg"" />"
elseif a=1 then
response.write "<img src=""2.jpg"" />"
end if
%>

条件比较多时也可以这样用：
<%
select case a
case 0
response.write "<img src=""1.jpg"" />"
case 1
response.write "<img src=""2.jpg"" />"
case 2
response.write "<img src=""3.jpg"" />"
case 3
response.write "<img src=""3.jpg"" />"
end select
%>

<%if A=1 then%>
<img src="图片1.jpg">
<%end if%>
<%if A=0 then%>
<img src="图片2.jpg">
<%end if%>

<%
Select Case A
Case 1
response.write("<img src='图1路径'>"