帮我看看错在哪里？

Question

<script language="javascript" type="text/javascript">
  <!--
   var mm=new Array(3);
        mm[0]=["00","01","02","03","04"];
        mm[1]=["10","11"];
        mm[2]=["20","21","22","23"];
   function remove(sel)
   { for (var i=0;i<sel.options.length-1;i++)
        sel.options[i]=null;
   }
   function addoptions(optionlist,sel)
   {  var k=0;
       var j=0;
        remove(sel);
   for(k=0;k<3;k++)
    { if (eval("form2.radiogroup"+k+".checked"))
   {  
        for(j=0;j<optionlist.length;j++)
        sel[j]=new Option(optionlist[j],optionlist[j]); 
}
  break;
}
   }
   //-->
</script><form name="form2" method="post" action=""margin="0">
                   <input type="radio" name="radiogroup0" value="0"checked="checked" onclick="addoptions(mm[0],sel)">
                  0 
                  <input type="radio" name="radiogroup1" value="1"onclick="addoptions(mm[1],sel)">
                  1 
                  <input type="radio" name="radiogroup2" value="2"onclick="addoptions(mm[2],sel)">
                  2
                  <select name="sel"style="position:relative;top:3px">
                    <option selectedvalue="0">00</option>
                    <option value="1">01</option>
                    <option value="2">02</option>
                    <option value="3">03</option>
                    <option value="4">04</option>
                   </select>

Answer 1

to gzh_seagull(不可) ：
  我说错了，是一组单选纽，name属性要一样啊

Answer 2

<script language="javascript" type="text/javascript">
  <!--
   var mm=new Array(3);
        mm[0]=["00","01","02","03","04"];
        mm[1]=["10","11"];
        mm[2]=["20","21","22","23"];
   function remove(sel)
   { for (var i=0;i<sel.options.length-1;i++)
        sel.options[i]=null;
   }
   function addoptions(optionlist,sel)
   {  var k=0;
       var j=0;
        remove(sel);
 
for(j=0;j<optionlist.length;j++)
sel[j]=new Option(optionlist[j],optionlist[j]); 

   }
   //-->
</script><form name="form2" method="post" action=""margin="0">
                   <input type="radio" name="radiogroup" value="0"checked="checked" onclick="addoptions(mm[0],sel)">
                  0 
                  <input type="radio" name="radiogroup" value="1"onclick="addoptions(mm[1],sel)">
                  1 
                  <input type="radio" name="radiogroup" value="2"onclick="addoptions(mm[2],sel)">
                  2
                  <select name="sel"style="position:relative;top:3px">
                    <option selectedvalue="0">00</option>
                    <option value="1">01</option>
                    <option value="2">02</option>
                    <option value="3">03</option>
                    <option value="4">04</option>
                   </select>

Answer 3

<script language="javascript" type="text/javascript">
  <!--
   var mm=new Array(3);
        mm[0]=["00","01","02","03","04"];
        mm[1]=["10","11"];
        mm[2]=["20","21","22","23"];
   
   function addoptions(optionlist,sel)
   {  var k=0;
       var j=0;
        //remove(sel);
sel.options.length=0;
 
for(j=0;j<optionlist.length;j++)
sel[j]=new Option(optionlist[j],optionlist[j]); 

   }
   //-->
</script><form name="form2" method="post" action=""margin="0">
                   <input type="radio" name="radiogroup" value="0"checked="checked" onclick="addoptions(mm[0],sel)">
                  0 
                  <input type="radio" name="radiogroup" value="1"onclick="addoptions(mm[1],sel)">
                  1 
                  <input type="radio" name="radiogroup" value="2"onclick="addoptions(mm[2],sel)">
                  2
                  <select name="sel"style="position:relative;top:3px">
                    <option selectedvalue="0">00</option>
                    <option value="1">01</option>
                    <option value="2">02</option>
                    <option value="3">03</option>
                    <option value="4">04</option>
                   </select>

Answer 4

用这个很好，但是将mm[i]的元素全换成汉字，就不行了
清空之后，就什么都没了，怎么会这样

Answer 5

<script language="javascript" type="text/javascript">
  <!--
   var mm=new Array(3);
        mm[0]=["动作片","科幻片","喜剧片","爱情片","恐怖片","连续剧","战争片","动画片","古装片","MTV","flash"];
       mm[1]=["歌曲名","歌手名"];
       mm[2]=["系统工具","实用工具","网络工具","媒体工具","娱乐工具"];
   
   function addoptions(optionlist,sel)
   {  
       var j=0;
   
      sel.options.length=0;
    for(j=0;j<optionlist.length;j++)
    sel[j]=new Option(optionlist[j],optionlist[j]); 
   }
   //-->
</script><form name="form2" method="post" action=""margin="0">
   <input type="radio" name="radiogroup"   
    value="影视"checked="checked" onclick="addoptions(mm[0],sel)">
                 影视
   <input type="radio" name="radiogroup"  
    value="音乐"onclick="addoptions(mm[1],sel)">
                音乐
   <input type="radio" name="radiogroup" 
    value="软件"onclick="addoptions(mm[2],sel)">
                 软件
   <select name="sel"style="position:relative;top:3px">
             <option selectedvalue="0">全部</option>
    </select>
页面重载的时候，就显示一个“全部”，当单击单选纽时，就清空了，什么也没有

Answer 6

谢谢你，好了，刚才只是我网页没有刷新
问个问题，function remove(sel)
   { for (var i=0;i<sel.options.length-1;i++)
        sel.options[i]=null;
   } 这个函数也应该可以清空吧？

Answer 7

sel.options.length-1 不用 -1