asp.net网站,输入用户名和密码后登录,没有反应
第一次可以登入,之后就是输入用户名和密码后,点击登录,页面会重新刷新显示,但是登入不了,怎么解决
<div class="tips_title" style="cursor: move;">
<h2 class="tips_title_text">
用户登录</h2>
<span class="close" id="flclose"><a href="javascript:void(0)" class="tips_close">关闭</a></span></div>
<div class="tips_content">
<div class="dl_tips" id="error_tips" style="display: none;">
<b class="dl_err"></b>您输入的账户名和密码不匹配,请重新输入。</div>
<form class="tips_form" method="post" action="/login" onsubmit="return false;" id="loginForm" rel="nofollow">
<table width="100%" cellspacing="0" cellpadding="0" border="0">
<tbody><tr>
<td width="58">
用户名:
</td>
<td width="205">
<input class="tips_txt" id="lu" name="u" placeholder="用户名/手机号码" type="text">
</td>
<td>
<a href="/register.html" class="font_size12 gray" target="_blank" rel="nofollow" tabindex="-1">免费注册</a>
</td>
</tr>
<tr>
<td>
密 码:
</td>
<td>
<input class="tips_txt" id="lp" name="p" type="password">
</td>
<td>
<a class="font_size12 gray" href="/repassword.html" target="_blank" rel="nofollow" tabindex="-1">忘记密码</a>
</td>
</tr>
<tr>
<td>
验证码:
</td>
<td colspan="2">
<input class="tips_txt tips_yzm" id="yzmtext" name="c" maxlength="4" type="text"><span class="tips_yzm_notice" id="tips_yzm_notice" style="display: none;"><span class=""></span></span>
<img class="yzm_img" id="yzmimg" style="cursor: pointer; display: inline; width: 102px; height: 42px;" src="http://www.****.com/tools/verify_code.ashx?_=1479881996877"><a class="font_size12 yzm_btn" href="javascript:void 0" id="yzmup" title="重新获取验证码">换一张</a>
</td>
</tr>
<tr>
<td>
</td>
<td colspan="2">
<a class="btn_orange" href="javascript:void(0)" id="floginbtn">登录</a> <a class="font_size12 gray" href="/help/show-217.html" style="position: absolute; display: inline-block; line-height: 30px;" target="_blank">如何开启手机号登录?</a>
</td>
</tr>
</tbody></table>
</form></div>
<div class="tips_btn">
<p class="hz_cnt font_size12">合作账号登录:
<a title="QQ" href="/api/oauth/qq/index.aspx"><img src="/upload/201301/22/201301222356267017.png"></a>
</p>
</div>
<input value="1" name="t" type="hidden">
<input value="" name="rw" id="rw" type="hidden">
<input value="0" name="islogin" type="hidden">