[无法发帖到技术区。只好在这里借用]请教,组合起来的checkbox

<form>
<input name="a" type="checkbox" value="a" />
<input name="a" type="checkbox" value="b" />
<input name="a" type="checkbox" value="c" />
</form>
<script>
alert(document.forms[0].a)
</script>

<input name="a" type="checkbox" value="a" /> 
<input name="a" type="checkbox" value="b" /> 
<input name="a" type="checkbox" value="c" /> 
<script type="text/javascript"> 
 var checkbox = document.getElementsByName("a")
 for(var i=0;i<checkbox.length;i++)
 {
   ...
  }
</script>

stardy：

<input name="a" type="checkbox" value="a" /> 
<input name="a" type="checkbox" value="b" /> 
<input name="a" type="checkbox" value="c" /> 
<script type="text/javascript"> 
 var checkbox = document.getElementsByName("a")
 for(var i=0;i<checkbox.length;i++)
 {
   ...
  }
</script>

回到原帖

<input name="a" type="checkbox" value="a" /> 
<input name="a" type="checkbox" value="b" /> 
<input name="a" type="checkbox" value="c" /> 
<script type="text/javascript"> 
var inputList = document.getElementsByTagName("input")
  for(var i=0;i<inputList.length;i++) {
     var aInput = inputList[i];
     if("checkbox" == aInput.getAttribute("type")) {
         if("a" == aInput.getAttribute("name")) {
              ....
         }
     }
  }
</script>