日期:2014-05-16 浏览次数:20569 次
<!DOCTYPE HTML>
<html>
<head>
<meta charset="gb2312" />
<title></title>
<style>
</style>
</head>
<body>
<table id="myTable" border="1">
<thead>
<tr>
<th>Month</th>
<th>Savings</th>
<th>Savings33</th>
</tr>
</thead>
<tbody>
<tr>
<td>January</td>
<td>$100</td>
</tr>
<tr>
<td>February</td>
<td>$80</td>
</tr>
</tbody>
<tbody>
<tr>
<td>January</td>
<td>$102</td>
</tr>
<tr>
<td>February</td>
<td>$82</td>
</tr>
</tbody>
<tbody>
<tr>
<td>January</td>
<td>$300</td>
</tr>
<tr>
<td>February</td>
<td>$380</td>
</tr>
</tbody>
</table>
<script src="https://ajax.googleapis.com/ajax/libs/mootools/1.3.2/mootools-yui-compressed.js"></script>
<script>
alert( $('myTable').getChildren('tbody').length )
</script>
</body>
</html>
------解决方案--------------------
<script type="text/javascript">
myTable=document.getElementById("myTable");
tbody = myTable.getElementsByTagName("tbody");
alert(tbody.length);
</script>