为什么 运行后就直接执行了response.write "<script>alert('登录失败!!!');history.back();
程序代码：<!--#Include file="conn.asp"-->
<%
Dim Sql,rs,username,password
username=request.form("username")
password=request.form("password")
set rs=server.createobject("adodb.recordset")
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>网上书城</title>
<link href="images/style.css" rel="stylesheet" type="text/css">
<style type="text/css">
<!--
#Layer1 {
width:778px;
height:335px;
position:absolute;
left:49%;
top:39%;
margin:-205px 0 0 -380px;
}
#Layer2 {
position:absolute;
width:359px;
height:89px;
z-index:2;
left: 389px;
top: 88px;
}
-->
</style>
</head>
<body>
<div id="Layer1">
<div align="left"><img src="images/login_pic.png" width="378" height="265" align="bottom" /><img src="images/login_right.jpg" width="400" height="340" border="0" align="absmiddle" usemap="#Map" />
<map name="Map">
<area shape="rect" coords="201,38,281,71" href="tiao.asp">
<area shape="rect" coords="143,234,218,264" href="adminloginform.asp">
</map>
<div id="Layer2">
<form name="loginfo" method="POST" action="login.asp">
<table width="237" border="0" align="center" bgcolor="#EDF6FF">
<tr>
<td width="64">用户名：</td>
<td width="120"><input type="text" name="username"></td>
</tr>
<tr>
<td>密码：</td>
<td><input type="password" name="password"></td>
</tr>
<tr>
<td colspan="2">
<div align="center">
<input type="submit" name="Submit" onClick="return check();" value="登录">
<input type="reset" name="Submit2" value="重置">
</p>
</div></td></tr>
</table>
</form>
</div>
</div>
</div>
</body>
</html>
<%
sql="select username,password from admin where username='"&username&"'"
rs.open sql,conn,1,1
if rs.eof then
response.write "<script>alert('登录失败!!!');history.back();</script>"
response.end
else
if rs("password")<>password then
response.write "<script>alert('登录失败!!');history.back();</script>"
response.end
end if
response.write"<script>alert('登录成功');location.href='" & request.ServerVariables("HTTP_REFERER")& "';</script>"
end if
%>
<script language="JavaScript">
<!--
function check()
{
if(checkspace(document.loginfo.username.value)) {
document.loginfo.username.focus();
alert("用户名不能为空！");
return false;
}
if(checkspace(document.loginfo.password.value)) {
document.loginfo.password.focus();
alert("密码不能为空！");
return false;
}
}
function checkspace(checkstr) {
var str = '';
for(i = 0; i < checkstr.length; i++) {
str = str + ' ';
}
return (str == checkstr);
}
//-->
</script>
