<table >
<tr id="tr1">
<td>asdasds
</td>
<td>asdasd
</td>
</tr>
</table>
<script language=javascript>
var objtr=document.getElementById("tr1")
var trClone = objtr.cloneNode(true);
alert(trClone.childNodes.length)
</script>
<tr id="tr1">
<td>asdasds
</td>
<td>asdasd
</td>
</tr>
</table>
<script language=javascript>
var objtr=document.getElementById("tr1")
var trClone = objtr.cloneNode(true);
alert(trClone.childNodes.length)
</script>
var trClone = tr.cloneNode(true);// 但是这里却输出为 0 ????
alert(trClone.childNodes.length); //这里不要用cells改成childNodes除非你再把trClone插入到表格中才可能再用trClone.cells.length