js在ie下正常传值firefox没有值

Question

<script>
    function Checker()
    {
       var myform=document.getElementById('myform');
   var obj = document.getElementsByTagName('input');
       var objLen= obj.length;
       var a;
       var i;
       a=false;
       for (i = 0;i< objLen;i++){
           if ((obj[i].type=="checkbox")&&(obj [i].checked==true)) {
               a= true;
               break;
              }
  }
       myform.items.value = "";
      if(a==true){
        if ( myform.rsstype.length==0 ) // 只有一个复选框，form1.item.length = undefined
        { 
             if ( myform.rsstype.checked )
             myform.items.value = myform.rsstype.value;
        }
        else
        {   
           for( i = 0 ; i < myform.rsstype.length ; i++ )
            {
                if ( myform.rsstype(i).checked ) // 复选框中有选中的框
                {
                    myform.items.value = myform.rsstype(i).value;
                    for( j = i + 1 ; j  < myform.rsstype.length ; j++ )
                    {
                        if ( myform.rsstype(j).checked )
                        {
                            myform.items.value += "|"; //用|做分割符
                            myform.items.value += myform.rsstype(j).value;
                        }
                   }
                    break;
                }
           
}
        }
        return true;
     }else{
      alert("请选择订阅的类别");
          return false;
    }
    }
  
</script>
myform.items.value在firefox下是空的，求助！

Answer 1

{if !isset($_GET['t'])}    <div id="rss_top">
        <div class="rss_pic"><a href="#"><img src="{IMG_PATH}rss/dy_pic2.jpg" alt="期刊订阅" /></a></div>
    </div>
<form action="" method="post" name="myform" id="myform" >
    <div id="rss_content2"> <span class="rss_ico1"><img src="{IMG_PATH}rss/dy_ico4.jpg" /></span>
        <div class="rss_sum1">
            <p class="rss_fc1" style="padding-left:100px">您好！只需要花费1分钟填写完毕下列资料，我们将为您发送业内最新的资讯,使您与39万企业通信人同享的免费资讯大餐！</p>
            <p class="rss_t rss_fc2">注：以下带*号为必填项。</p>            <table class="rss_table table_form">
                <tr>
                    <td class="td_w1">{L('Email')}：</td>
                    <td ><input name="email" id="email" type="text"  class="input" value="{$rs_email}" />
                        <span id="semail" class="rss_fc2">*</span></td>
                </tr>
                <tr>
                    <td class="td_w1">{L('realname')}：</td>
                    <td><input name="username" id="username"  type="text" class="input" value="{$user_info['username']}" />
                        <span id="susername" class="rss_fc2">*</span></td>
                </tr>
                {if $_userid==null || $newemail=='a'}
                <tr>
                    <td class="td_w1">{L('password')}：</td>
                    <td><input id="password" name="password" type="password" class="input" />
                        <span id="spassowrd" class="rss_fc2">*</span></td>
                </tr>
                <tr>
                    <td class="td_w1">{L('cofirmpwd')}：</td>
                    <td><input id="pwdconfirm" name="pwdconfirm" type="password" class="input" />
                        <span id="sconfirmword" class="rss_fc2">*</span></td>
                </tr>
                {/if}                <tr>
                    <td class="td_w1">{L('rssType')}：</td>
                    <td id="rsst">
                        <?php 
                        if(is_array($type_arr)){
foreach($type_arr as $typeid => $type){?>
    <input name="rsstype" class="aa"  type="checkbox" value="<?php echo $type;?>" /><?php echo $type;?>&nbsp;
                                 <?php }}?>
                                 <span id="srsstype" class="rss_fc2">*</span>
                    </td>
                </tr>
                
                {loop $forminfos $f $a}
                {loop $fieldarray $f1 $a1}
                {if $a['name']==$a1}
                <tr>
                    <td class="td_w1">{$a['name']}：{if $a['tips']}<br />({$a['tips']}){/if}</td>
                    <td>{$a['form']}{if $a['isbase']}{/if} <span id="{$f1}" style="color:red"><font color=red>*</font></span></td>
                </tr>
                {/if}
                {/loop} {/loop}                {loop $forminfos $k $v}
                {loop $fieldarray1 $k1 $v1}
                {if $v['name']==$v1 }
                <tr class="try1" style="display:none">
                    <td class="td_w1">{$v['name']}：{if $v['tips']}<br />({$v['tips']}){/if}</td>
                    <td>{$v['form']}{if $v['isbase']}{/if}<font color=red>*</font> </td>
                </tr>{/if}
                {/loop}
{/loop}
                <tr>
                    <td colspan="2" align="right"> 同时订阅<span class="rss_fc3">『运营与增值网(D1COM)』</span>期刊
                        <input type = "radio" value = "0"  name = "ss" />
                        {L('no')}
                        <input type = "radio" value = "1"  name = "ss" />
                        {L('yes')}</td>
                </tr>
                {if $_userid==null}
                <tr>
                    <td class="td_w1">{L('checkcode')}：</td>
                    <td>   <input type="text" id="code" name="code" size="10" class="input-text"/>{form::checkcode('code_img', '4', '14', 80, 24)}
                        <span class="rss_fc2">*点击可更换图片</span></td>
                </tr>
                {/if}
                <tr>
                    <td colspan="2" align="right" style="text-align:left; padding-left:100px;">
                        {if $_userid==null}
                        <input type="submit" value=""  style="border:0px;background:url({IMG_PATH}rss/dy_ico6a.jpg) no-repeat;height:33px; width:81px;"  name="dosubmit" onclick="return Checker()" class="button"/>
                        {/if}
                        {if $_userid!=null}
                        <input type="submit" value=""  style="border:0px;background:url({IMG_PATH}rss/dy_ico6b.jpg) no-repeat;height:33px; width:81px;"  name="dosubmit1" onclick="return Checker()" class="button"/>
                        {/if}<input type="hidden" name="items" value=""/>
                    </td>
                </tr>            </table>
        </div>
        <div class="clear"></div>
        </div>
</form>
       <!-- <div class="rss_sum2" style="float:right; width:120px; text-align:left;">
            <p style="padding-top:100px;"> 已经有了帐号？</p>
            请直接登录<br/>
            <input type="button" name="dosubmits"  value="{L('login')}" onclick="redirect('{APP_PATH}index.php?m=member&c=index&a=login')"/>
        </div>-->
{/if}

Answer 2

myform.items.value没有值，if ( myform.rsstype.length==0 )和else都没有执行到直接就return true了

Answer 3

楼主你是不是想判断checkbox有多少个？
<input name="rsstype" class="aa" type="checkbox" value="<?php echo $type;?>" />if ( myform.rsstype.length==0 )
你这么写肯定不对改成这样
if(document.getElementsByName('rsstype').length == 0)

Answer 4

两点：
1、myform.rsstype 这样写的意思是 name为myform的表单里边 name为rsstype的元素
2、获取所有name为rsstype的元素 用document.getElementsByName('rsstype') 返回一个集合