以前不懂给table加细边框，无意中看到有人设计的网页有这种样式：
<html>
<head>
<title>XXX</title>
<style>
.table_border{
border: solid 1px green;
border-collapse: collapse;
overflow:auto;
overFlow-x: scroll ;
border-style: solid ;
}
.table_border tr th{
padding-left:4px;
height:27px;
border: solid 1px green;
}
.table_border tr td{
height:25px;
padding:4px;
border: solid 1px green;
}
</style>
</head>
<body>
<table class="table_border" width="100%" border="0" cellpadding="0" cellspacing="0.5">
<tr>
<th width="60"><input type="checkbox" name="all_box" id="all_box" onclick="selectCheckBoxAll('all_box','chkBoxName')"/></th>
<th></th>
<th></th>
<th></th>
<th></th>
<th></th>
</tr>
<tr>
<td width="60" align="center"><input type="checkbox" name="chkBoxName" id="all_box" value="<s:property value='#userGroup.groupId'/>"/></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
<tr>
<td width="60" align="center"><input type="checkbox" name="chkBoxName" id="all_box" value="<s:property value='#userGroup.groupId'/>"/></td>
<td></td>
<td></td>
<td></td>
<td></td>
<td></td>
</tr>
</table>
<body>
</html>这样就OK了！