Jquery根據id獲取該id下子元素的值

<div class="form-group">
    <div id="putPageA">
        <label for="action"
               class="col-sm-3 col-md-3 col-lg-3 control-label">菜單動作：<code>*</code></label>
        <div class="col-sm-6 col-md-6 col-lg-6">
            <select class="form-control" id="action" name="action">
                <option value="產品分類"
                        <c:if test='${model.action== "產品分類"}'>selected</c:if> >產品分類
                </option>
                <option value="限時搶購"
                        <c:if test='${model.action== "限時搶購"}'>selected</c:if> >限時搶購
                </option>
               
            </select>
        </div>
    </div>
<div>



var action = $("#putPageA").find("[name='action']").val();

$("#Aobj_2_2").children("span").text();

$("#Aobj_2_2").children("i").attr("title");

jquery點擊獲取子元素ID值 

    <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>



$(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++){//創建一個數字數組
        arr[index] = index;
    });
    $.each(arr, function(i){//循環得到不同的id的值
        var idValue = $(".category-dl dd").children().eq(i).attr("id");
        if(idValue != ''){
            alert(idValue);
        }
    });

})