jquery Easyui Datagrid实现批量操作（编辑，删除，添加）

valueField:'productid',
textField:'productname',
method:'get',
url:'products.json',

}
}">Product</th>
<th data-options="field:'listprice',width:80,align:'right',editor:{type:'numberbox',options:{precision:1}}">List Price</th>
<th data-options="field:'unitcost',width:80,align:'right',editor:'numberbox'">Unit Cost</th>
<th data-options="field:'attr1',width:250,editor:'textbox'">Attribute</th>
<th data-options="field:'status',width:60,align:'center',editor:{type:'checkbox',options:{on:'P',off:''}}">Status</th>
</tr>
</thead>
</table>

<div id="tb" style="height:auto">
<a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="easyui-linkbutton" data-options="iconCls:'icon-add',plain:true" onclick="append()">Append</a>
<a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="easyui-linkbutton" data-options="iconCls:'icon-remove',plain:true" onclick="removeit()">Remove</a>
<a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="easyui-linkbutton" data-options="iconCls:'icon-save',plain:true" onclick="accept()">Accept</a>
<a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="easyui-linkbutton" data-options="iconCls:'icon-undo',plain:true" onclick="reject()">Reject</a>
<a href="javascript:void(0)" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="easyui-linkbutton" data-options="iconCls:'icon-search',plain:true" onclick="getChanges()">GetChanges</a>
</div>

<script type="text/javascript">
//编辑的行
var editIndex = undefined;
function endEditing() {
if (editIndex == undefined){return true}
$('#dg').datagrid('endEdit', editIndex);
editIndex = undefined;
return true;
}

function onClickCell(index, field){
if (editIndex != index) {
if (endEditing()) {
$('#dg').datagrid('selectRow', index)
.datagrid('beginEdit', index);
var ed = $('#dg').datagrid('getEditor', { index: index, field: field });
if (ed) {
($(ed.target).data('textbox') ? $(ed.target).textbox('textbox') : $(ed.target)).focus();
}
editIndex = index;
} else {
setTimeout(function () {
$('#dg').datagrid('selectRow', editIndex);
}, 0);
}
}
}
function onEndEdit(index, row){