在这样的表中：
<table>
<!-- Insert Row of bun here -->
<tr id="meat">
<td>Hamburger</td>
</tr>
<!-- Insert Row of bun here -->
</table>
function AddBefore(rowId){}
function AddAfter(rowId){}
解决方法
使用
function AddBefore(rowId){
var target = document.getElementById(rowId);
var newElement = document.createElement('tr');
target.parentNode.insertBefore(newElement,target);
return newElement;
}
function AddAfter(rowId){
var target = document.getElementById(rowId);
var newElement = document.createElement('tr');
target.parentNode.insertBefore(newElement,target.nextSibling );
return newElement;
}
