复选框的问题，高手请来帮忙！

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
  <TITLE> New Document </TITLE>
<script>
function  fun(){var ary = document.getElementsByName("a");
var str = "";
    for(var i=0;i<ary.length;i++){         if(ary[i].checked){
str = str + ary[i].value;
} }
document.getElementById("text").value =  str;

}
</script>
</HEAD> <BODY>

<form>
<table>
  <tr>
     <td>
      <input type="checkbox" name="a" value="aaa" onclick = "fun()">
      <input type="checkbox" name="a" value="bbb"  onclick = "fun()">
      <input type="checkbox" name="a" value="ccc"  onclick = "fun()">
     <td>
    <textarea name="text" cols="60" rows="10" readonly></textarea>
     </td>
   </tr>
</table>
</form>

解决方案 »

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<script type='text/javascript'>
function show(obj){
if(obj.checked == true){
document.getElementsByName('text')[0].value +=obj.value;
}else{
var re = new RegExp("["+obj.value+"]","g");
document.getElementsByName('text')[0].value = document.getElementsByName('text')[0].value.replace(re,"");
}
}
</script>
<table>
  <tr>
     <td>
      <input type="checkbox" name="a" value="a" onclick="show(this);">
      <input type="checkbox" name="b" value="b" onclick="show(this);">
      <input type="checkbox" name="c" value="c" onclick="show(this);">
     <td>
    <textarea name="text" cols="60" rows="10" readonly></textarea>
     </td>
   </tr>
</table>
参考一下吧
谢谢楼上两位，我用了别的方法做的！没用循环，觉的循环没有分开的函数好（个人观点）下面放上我写的代码以求意见。当然分会给楼上两位的。<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML >
  <HEAD >
  <SCRIPT LANGUAGE="JavaScript">
  
  </SCRIPT>
     <TITLE > New Document  </TITLE >   </HEAD >   <BODY >

<form name="form">
<table >
</tr>
   <td >
       <textarea name="text1" cols="60" rows="10" readonly > </textarea >
   </td >
</tr >
<tr >
   <td >
       苹果<input type="checkbox" name="a" value="1"  onclick = "fun1()"/ >
               <input type="hidden" name="a1" value="苹果"/ >
       梨子<input type="checkbox" name="b" value="1"  onclick = "fun2()" />
               <input type="hidden" name="b1" value="梨子"/ >
       香蕉<input type="checkbox" name="c" value="1"  onclick = "fun3()"/ >
               <input type="hidden" name="c1" value="香蕉"/ >
   </td>
</tr>
</table >
</form >
</body>
</html>