请教:用户登录验证问题

<td width="39%" height=28> <div class=cn_12px_blue3 align=right>用户名：</div></td>
                          <td width="61%" height=28><input name=Teach_Login   size=15  maxlength=16 ID=Teach_Name> </td>//加上ID=Teach_Name
                        </tr>
                        <tr align=left> 
                          <td height=35 align="right">密 码： </td>
                          <td height=35><input name=Teach_Pass  type=password  size=15 maxlength=16 ID=Teach_Pass> </td>//给input加上 id

解决方案 »

  1.   

    <HTML><HEAD><script language="JavaScript">
    function SetFocus()
    {
    document.forms.Login_Form.Flag.value="";
    document.forms.Login_Form.Teach_Name.focus();
    }
    function CheckData()
    {
    if(window.document.Login_Form.Teach_Name.value=="")
    {
    alert("请输入用户名！");
    document.Login_Form.Teach_Name.focus();
    return false;
        }
    if(window.document.Login_Form.Teach_Pass.value=="")
    {
    alert("请输入密码！");
    document.Login_Form.Teach_Pass.focus();
    return false;
        }
    //if (window.document.Login_Form.Teach_Name.value!="") && (window.document.Login_Form.Teach_Pass.value!="")
           // {
    //  window.document.Login_Form.Flag="check";
    //  Login_Form.submit();
    //}}
    </script>
    </HEAD>
    <body><form name="Login_Form" method="post" action="default.asp" ID=Form1>
      <table width="100%" height="100%" border="0" cellpadding="0" cellspacing="0">
        <tr>
          <td align="middle" valign="top">
             <p>&nbsp;</p>
             <table width="680" border="0" align="center" cellpadding="0" cellspacing="0" >
      <tr> 
    <td height="30" align="right" valign="center"> 
      <div class=cn_12px_blue3 align=right></div>
      <a href="help/Help.htm" target="_blank" class="font1"> 查看帮助 
      </a>  |  <a href="mailto:[email protected]"   class="font1"> 联系我们<img src="images/blank.gif" width="20" height="10" border="0" align="absMiddle"> 
      </a> </td>
      </tr>
                  <tr>
                    <td align="middle" valign="center">
                       <table width="627" height="259" border="0" cellpadding="0" cellspacing="0" background="images/WebLogin.gif">
    <tr> 
      <td width="368" height="93">&nbsp;</td>
      <td width="259">&nbsp;</td>
    </tr>
                    <tr> 
                      <td>&nbsp;</td>
                      <td align="left" valign="top"> 
                        <table width="216" height="134" style="BORDER-RIGHT: #ffffff 1px solid; BORDER-TOP: #ffffff 1px solid; BORDER-LEFT: #ffffff 1px solid; BORDER-BOTTOM: #ffffff 1px solid" border=0 cellpadding=0   cellspacing=3 background="images/WebLogin2.gif">
                          <tbody>
                            <tr align=middle valign="bottom"> 
                              <td height=10  colspan=2></td>
                            </tr>   
                            <tr> 
                              <td width="39%" height=28> <div class=cn_12px_blue3 align=right>用户名：</div></td>
                              <td width="61%" height=28><input name=Teach_Login   size=15  maxlength=16 ID=Teach_Name> </td>
                            </tr>
                            <tr align=left> 
                              <td height=35 align="right">密 码： </td>
                              <td height=35><input name=Teach_Pass  type=password  size=15 maxlength=16 ID=Teach_Pass> </td>
                            </tr>
                            <tr align=middle> 
                              <td height=25> 
                                <input name="Flag" type="hidden" ID=Hidden1> </td>
                              <td height=25 align="left"> 
                                <input name="cmdSubmit"  type="submit"  value="  登 录  "  class="ibbtn" onClick="javascript:return(CheckData(this.form))" ID=Submit1></td>
                            </tr>
                            <tr align=middle valign="bottom"> 
                              <td height=17>&nbsp;</td>
                              <td height=17 align="left"><font color="#ff0000"></font></td>
                            </tr>
                          </tbody>
                        </table>
                      </td>
                    </tr>
                  </table>
                  <table width="627" border="0" cellspacing="0" cellpadding="0">
                    <tr>
                      <td>&nbsp;</td>
                    </tr>
                  </table>
       </td>
              </tr>
            </table>
            <BR>
          </td>
        </tr>
      </table>
    </form></body></HTML>
      

  2.   

    把这句javascript:return CheckData()加到form 的 onsubmit中试试
    onsubmit="javascript:return CheckData()"
      

  3.   

    OK了！是我的失误，呵呵，Teach_Login和Teach_Name的原因! :) 多谢各位！