純JavaScript實現彈出選擇第幾個選項按鈕

純JavaScript實現彈出選擇第幾個選項按鈕

 1 <div id="a" name="aa">  2     <input type="radio" name="aab" value="22" />  3     <input type="radio" name="aab" value="22" />  4     <input type="radio" name="aab" value="22" />  5     <input type="radio" name="aab" value="22" />  6 </div> 7  8 <script type="text/javascript">  9     var list = document.getElementById("a").children; 10     for (var i = 0; i < list.length; i++) { 11         list[i].attributes["index"] = i + 1; 12         list[i].onclick = function () { 13             alert(this.attributes["index"]); 14         } 15     } 16 </script>