新手请教高手!!


    <head>
        <style type="text/css">
            #Button1
            {
                height: 27px;
                width: 48px;
            }
            #Button2
            {
                width: 45px;
            }
        </style>
    </head>
    <p>
        
<table cellspacing="0" rules="all" border="1" id="EditView1" style="border-collapse:collapse;">
<tr class="Browse_Header" align="center">
<th scope="col" style="width:20px;">
                <input type="checkbox" id="RowAllSelect" onclick="EditView_SelectAllRowItem(this, 'RowAllSelect')" />
            </th><th scope="col" style="width:40px;">序号</th><th scope="col" style="width:60px;">
                &nbsp;</th><th scope="col" style="width:100px;"><a href="javascript:__doPostBack('EditView1','Sort$FeeName')">费用名称</a></th><th scope="col" style="width:50px;"><a href="javascript:__doPostBack('EditView1','Sort$IsPayee')">收付</a></th><th scope="col" style="width:50px;"><a href="javascript:__doPostBack('EditView1','Sort$IsCommission')">代结</a></th><th scope="col" style="width:50px;"><a href="javascript:__doPostBack('EditView1','Sort$IsFact')">实际</a></th><th scope="col" style="width:50px;"><a href="javascript:__doPostBack('EditView1','Sort$IsInner')">划拨</a></th><th scope="col" style="width:40px;"><a href="javascript:__doPostBack('EditView1','Sort$OrderNo')">序号</a></th><th scope="col" style="width:60px;"><a href="javascript:__doPostBack('EditView1','Sort$TacheAction')">作用</a></th>
    <td>
                    </td>
</tr><tr class="Browse_Item" align="center">
<td>
                <input id="EditView1_ctl02_cbx_RowSelect" type="checkbox" name="EditView1$ctl02$cbx_RowSelect" group="RowAllSelect" onclick="EditView_SelectRowItem(this);" />
            </td><td>
1
</td><td>
<input type="submit" name="EditView1$ctl02$ctl00" value="编辑" class="ButtonCss" />
</td><td>
<div class="Div_Ellipsis" style="width:100px">运费</div>
</td><td>
<span disabled="disabled"><input id="EditView1_ctl02_IsPayee" type="checkbox" name="EditView1$ctl02$IsPayee" checked="checked" disabled="disabled" /></span>
</td><td>
<span disabled="disabled" style="display:inline-block;width:20px;"><input id="EditView1_ctl02_IsCommission" type="checkbox" name="EditView1$ctl02$IsCommission" disabled="disabled" /></span>
</td><td>
<span disabled="disabled"><input id="EditView1_ctl02_IsFact" type="checkbox" name="EditView1$ctl02$IsFact" checked="checked" disabled="disabled" /></span>
</td><td>
<span disabled="disabled"><input id="EditView1_ctl02_IsInner" type="checkbox" name="EditView1$ctl02$IsInner" disabled="disabled" /></span>
</td><td>
10
</td><td>
<div class="Div_Ellipsis" style="width:100px">运费</div>
</td>
</tr><tr class="Browse_Alter" align="center">

<
</tr>
</table>
<script language="javascript">
        //alert("sdfsd")
        
function Button1_onclick() {
<td>
function Button2_onclick() {}        </script>
问题:如何在最顶端添加一个"+","-",然后点击"+"号会新增一行,点击"-"号会减少一行!新手刚接触到编程,希望各位大虾帮忙小弟,