ajax无刷新技术对于站点的体验度非常好，现在的站点基本上都使用了 ajax 的无刷新，这一节我们来看一下如何使用 ajax 来对 ecshop 网站顶部登录与登出实现无刷新，ecshop 本身提供的模板是不支持无刷新的，每一次的登陆跳出都要刷新页面才行，给人的体验很不好，下面夏日博客就把 ecshop 顶部实现无刷新的效果代码分享一下。

找到 themes/xiariboke/library/member_info.lbi，将登陆登出的代码替换成如下的代码即可:

<!--{if $user_info}-->
<div class="lef_tit_bj">会员登陆</div>
<div class="left_conn_bj">
  <table width="100%" border="0" cellspacing="0" cellpadding="0">
    <tr>
      <td height="50" align="center" valign="middle"><label><strong>Hello {$user_info.username}</strong></label></td>
    </tr>
    <tr>
      <td height="30" align="center" valign="middle"><strong>欢迎光临本店</strong></td>
    </tr>
    <tr>
      <td height="40" align="center" valign="bottom"><label> <a href="user.php?act=logout"> <img src="../images/tuichu.gif"></a> &nbsp; <a href="user.php"> <img src="../images/jinrultan.gif"></a> </label></td>
    </tr>
  </table>
</div>
</div>
<!--{else}-->
<div class="lef_tit_bj">会员登录</div>
<div class="left_conn_bj">
  <form id="ECS_LOGINFORM" name="ECS_LOGINFORM" method="post" action="javascript:signIn()">
    <table width="100%" border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td height="50" align="right" valign="middle">用户名：</td>
        <td height="50" align="left" valign="middle"><label>
            <input type="text" name="username" class="yonhu_input"  style="height:15px;"/>
          </label></td>
      </tr>
      <tr>
        <td height="30" align="right" valign="middle"> 密&nbsp; 码：</td>
        <td height="30" align="left" valign="middle"><input type="password" name="password" class="yonhu_input" style="height:15px;" /></td>
      </tr>
      <tr>
        <td height="40" colspan="2" align="center" valign="bottom"><label>
            <input type="image" name="imageField" src="images/denglu_bann.jpg" />
            &nbsp; <a href="user.php?act=register"><img src="images/zhuce_bann.jpg" border="0" /></a> </label></td>
      </tr>
    </table>
  </form>
</div>
</div>
<!--{/if}--> 
{literal} 
<script type="text/javascript">
function signIn()
{
  var frm = document.forms['ECS_LOGINFORM'];
  if (frm)
  {
    var username = frm.elements['username'].value;
    var password = frm.elements['password'].value;
    var captcha = '';
    if (frm.elements['captcha'])
    {
      captcha = frm.elements['captcha'].value;
    }
    if (username.length == 0 || password.length == 0)
    {
{/literal}
       alert("{$lang.empty_username_password}");
{literal}
        return;
    }
    else
    {
       Ajax.call('user.php?act=signin', 'username=' + username + '&password=' + encodeURIComponent(password) + '&captcha=' + captcha, signinResponse, "POST", "TEXT");
    }
  }
  else
  {
    alert('Template error!');
  }
}
function signinResponse(result)
{
  var userName = document.forms['ECS_LOGINFORM'].elements['username'].value;
  var mzone = document.getElementById("ECS_MEMBERZONE");
  var res   = result.parseJSON();
  if (res.error > 0)
  {
    alert(res.content);
    if(res.html)
    {
      mzone.innerHTML = res.html;
      document.forms['ECS_LOGINFORM'].elements['username'].value = userName;
    }
  }
  else
  {
   if (mzone)
    {
      mzone.innerHTML = res.content;
   evalscript(res.ucdata);
      //alert(res.ucdata);
    }
    else
    {
      window.location.reload()
    }
  }
}
</script> 
{/literal}

另外还需要注意一点:ecshop 中经常会出现 js 冲突的问题，如果 js 冲突的问题已经解决并引用了jquery.json.js 的话，需要将其中的 var res = result.parseJSON(); 要改成:var res = $.evalJSON(result);