动态生成的html的Table中第一列是checkbox，如何判断选择了哪些checkbox，并获得相对应的记录_html/css_WEB-ITnose

function get(){
var print = document.getElementsByName("isprint");
for(var i = 0; i < print.length; i++) {
if(print[i].checked) {
var factorId = document.getElementById('factorId').value;
alert(factorId);
} 
}
}

<table class="grid">
<tfoot></tfoot> 
<tbody>
<tr>
<th width="30px" >序号</th>
<th>标签要素名称</th> 
<th>是否起用</th> 
</tr>
<s:iterator value="%{pageDataFactorDef.datals}" id='vo' status='st'>
<td align="center"><s:property value="#st.count+(pageDataFactorDef.currentPage-1) * 
(pageDataFactorDef.pageSize)" /></td>
<td>${vo.factorName}</td>
<td>
<input type="checkbox" name="isprint" id="isprint" />
</td>
<td align="center"> <input id="factorId" value="${vo.factorId}" type="hidden"></input>// 取得隐藏域id值
 
 </tr> 
</s:iterator> 
</tbody>
</table>

<input type="checkbox" name="isprint" id="isprint" cmdValue="${vo.factorId}" />
if(print[i].checked) {
alert(print[i].getAttribute("cmdValue"));
}

<input type="checkbox" name="isprint" id="isprint" />

<input type="checkbox" name="isprint<%# Container.ItemIndex+1 %>" id="isprint<%# Container.ItemIndex+1 %>" />

var rowCount = document.all.tbodyDetail.children.length - 1;
for (var i = 1; i <= rowCount; i++) {
var checkbox= form1["checkbox" + i].value.trim();
}