jquery在ie和firefox下的问题

Question

<input type="text" value="" class="sth"/>用jquery的$() 修改这个input的值，然后再获取并用alert显示：
在IE8下alert显示修改后的值，firefox下为什么显示值未修改呢？
但是重新用$().val()去获取却发现值已经被修改了。
就是说我用html()+append()方法每次都同样的一个input

Answer 1

上代码！
alert($("input .sth").val("hello").val());

Answer 2

$(".sth").attr("value","hello");
alert($(".sth").val());

Answer 3

<div id="tabs" >
    <ul id="myul" >
     <li >&nbsp;坚果</a></li>
        <li >&nbsp;zzzz</a></li>
    </ul>
    <div id="tabscontainer354793020010932">
        <div class="ui-tabs-panel ui-widget-content ui-corner-bottom" id="container354793020010932">
            <div id="354793020010932">
            <form onsubmit="return false;" method="post" class="module_FormEdit-form" id="Form-Add354793020010932">
                <input value="354793020010932" name="uniqueid[]" type="hidden">
                <table class="module_FormEdit-table">
                    <tbody>
                        <tr>
                            <td style="min-width: 60px;" width="60px">亲情</td>
                            <td style="min-width: 820px;" colspan="3" width="auto">
                                 <div class="groupField clearfix"></div>
                                 <div class="groupField clearfix"></div>
                                 <div class="groupField clearfix"></div>
                                 <div class="groupField clearfix"></div>
                            </td>
                        </tr>
                        <tr>
                            <td>普通</td>
                            <td colspan="3">
                                <div id="groupField354793020010932">
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                    <div class="groupField clearfix"></div>
                                </div>
                            </td>
                        </tr>
                    </tbody>
                </table>
            </form>
             <!-- Begin 入集群组模板-->
                 <div class="hidden" id="groupTemplate354793020010932">
                     <div class="groupField clearfix">
                          <dl>
                             <dt>
                                 <label>1</label>
                             </dt>
                             <dd>
                                 <input value="" name="field_cs_name[]" class="field_cs_name" type="text">
                             </dd>
                             <dd>
                                 <input value="" name="field_cs_number[]" class="field_cs_number" type="text">
                             </dd>
                             <dd>
                                 <input title="取消此人" alt="取消此人" src="../../../images/cancelperson.png" onclick="CancelPeople(this);" type="image" border="0">
                             </dd>
                          </dl>
                      </div>
                 </div>
              <!-- End 入集群组模板-->
            </div>
        </div>
    </div>代码如上，div中间的内容去掉了。
现在要做的就是先给“入集群组模板”，#groupTemplate354793020010932 的div中2个intput赋值，再将整个div中的内容添加到<div id="groupField354793020010932">中。$("#tabscontainer354793020010932 #groupTemplate354793020010932 .groupField .field_cs_name").val(name);
$("#tabscontainer354793020010932 #groupTemplate354793020010932 .groupField .field_cs_number").val(value);我是这样去赋值的，然后tpl=$("#groupTemplate354793020010932").html();
$("#groupField354793020010932").append(tpl);追加过去。
在ie下一切正常，在firefox下，添加过去的div下2个input都是空值，但用alert($("#tabscontainer354793020010932 #groupTemplate354793020010932 .groupField .field_cs_name").val(name));显示又是正确的。。头疼2天。。求高人稍稍看下。。

Answer 4

一楼的不行，一楼写的是input标签下子节点class名为sth的DOM
  嘎嘎，一楼获取DOM获取错了！！

Answer 5

tpl=$("#groupTemplate354793020010932").html();
setTimeout(function(){
    $("#groupField354793020010932").append(tpl);
}, 0);