你的 dingdan 字段是什么类型的？如果是数字类型的，就使用
<%
dingdan=request.form("dingdan")
if dingdan<>"" then
set rs=server.CreateObject("adodb.recordset")
rs.open "select * from shop_action where dingdan="&dingdan&"",conn,1,1
if rs.eof and rs.bof then
response.write "<script>alert('此订单号不存在！');history.go(-1);</script>"
response.end
end if
rs.close
set rs=nothing
else
response.write "<script>alert('订单号不能为空！');history.go(-1);</script>"
end if
%>
<%
dingdan=request.form("dingdan")
if dingdan<>"" then
set rs=server.CreateObject("adodb.recordset")
rs.open "select * from shop_action where dingdan="&dingdan&"",conn,1,1
if rs.eof and rs.bof then
response.write "<script>alert('此订单号不存在！');history.go(-1);</script>"
response.end
end if
rs.close
set rs=nothing
else
response.write "<script>alert('订单号不能为空！');history.go(-1);</script>"
end if
%>
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