jquery點擊獲取子元素ID值

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<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>無標題文檔</title>
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<script src="http://code.jquery.com/jquery-latest.js"></script>
<body>
<li class="category-item">
    <h2> 軟件開發
    <span class="glyphicon glyphicon-menu-right" aria-hidden="true"></span>
    </h2>
    <div class="category-item-box">
      <div class="category-dl">
        <dl>
            <dt>
              <h3>應用軟件開發</h3>
            </dt>
            <dd>
              <a href="/home/project/index/cid/4053" id="4053">企業軟件(ERP)</a>
              <a href="/home/project/index/cid/4054" id="4054">辦公自動化OA系統</a>
              <a href="/home/project/index/cid/4055" id="4055">客戶關係管理(CRM)</a>
              <a href="/home/project/index/cid/4056" id="4056">CMS系統開發</a>
            </dd>
        </dl>
        <dl>
            <dt>
              <h3>軟件插件開發</h3>
            </dt>
            <dd>
              <a href="/home/project/index/cid/4059" id="4059">瀏覽器插件</a>
              <a href="/home/project/index/cid/4060" id="4060">網站插件</a>
              <a href="/home/project/index/cid/4061" id="4061">播放器插件</a>
              <a href="/home/project/index/cid/4062" id="4062">應用插件</a>
            </dd>
        </dl>     
      </div>
    </div>
  </li>
<script type="text/javascript">
<!--
$(document).ready(function(){

	$(".category-item h2").click(function(){
	var len = $(".category-dl dd").children().size()//獲取H2下的a標籤個數
	var arr = [];
	for(var index = 0; index < len-1; index++){//建立一個數字數組
	arr[index] = index;
	}
	$.each(arr, function(i){//循環獲得不一樣的id的值
	var idValue = $(".category-dl dd").children().eq(i).attr("id");
	if(idValue != ''){
	alert(idValue);
	}
	});
	});
})




//-->
</script>
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