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div长度过小自动添加下拉

 <div style="height: 600px;overflow-y: auto;">    <table width="100%" border="0">        <tr>            <td width="15%" valign="top">                <UC:TreeView ID="MyTreeView" Target="frmMain" runat="server" />            </td>            <td width="5%">            </td>            <td valign="top" style=" width:80%;" cellspacing="0" cellspadding="0" >                <table width="100%" border="0">                    <tr>                        <td>                            <iframe id="frmMain" name="frmMain" src="SDMS_PermissionList.aspx" frameborder="0"                                width="100%" scrolling="no"></iframe>                        </td>                    </tr>                </table>            </td>        </tr>    </table>    </div>