<script type="text/javascript">
function remove() {
var table = document.getElementById("table"),
trs = table.getElementsByTagName("tr");
for(var i = trs.length - 1; i > 0; i--) {
table.deleteRow(i);
}
}
</script>
<table border="1" id="table">
<tr><td colspan="2">标题</td></tr>
<tr><td>1</td><td>2</td></tr>
<tr><td>3</td><td>4</td></tr>
<tr><td>5</td><td>6</td></tr>
<tr><td>7</td><td>8</td></tr>
</table>
<input type="button" onclick="remove()" value="删除" />