<html>
<body>
<table id="myTable" border="1">
<tr>
<th>月份</th>
<th>储蓄</th>
</tr>
<tr>
<td>一月</td>
<td>$100</td>
</tr>
<tr>
<td>二月</td>
<td>$150</td>
</tr>
</table>
<br>
<button type="button" onclick="myFunction()">折叠边框</button>
<script>
function myFunction()
{
document.getElementById("myTable").style.borderCollapse="collapse";
}
</script>
</body>
</html>