使用var tb =$(nowTr).parentsUntil("tr").remove();删除当前行，为什么无效？用parentsUntil怎么改？

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<title>无标题文档</title>





<script src="jquery-1.6.1.min.js"></script>







<script type="text/javascript">

$(document).ready//在文档加载后激活函数



(

	function()

	{

		

		$("#GetXml").click

		(

			function()

			{

	

				$.get

				(

					'score.xml', function(getsc)

					{ 

						var myXML;				 

						if( typeof getsc == "string" )

						{  

							alert(typeof getsc)		

							myXML = new ActiveXObject("Microsoft.XMLDOM");

							myXML.async = false;  

							myXML.loadXML(getsc);  

						}

						else

						{

							myXML = getsc;

						} 

						

						alert( $(myXML).find("stu").size());

						

						var t= $(myXML).find('stu');

						$(t).each

						(

							function()

							{ 



								var stu = $(this); //把当前对象转成jquery对象，$(this)是jquery对象，可以直接用jquery扩展的方法  this是dom对象

								var description = stu.find('name').text();

		$('#tab').append("<tr><td>"+"bb"+"</td><td>"+description+"</td><td><input type='button' value='delete' onclick='del(this)' /></td></tr>");

							}

						)

						

						

						

					}

				)

			

				

			}

		)





	}

)



</script>







</head>



<body >





<table id="tab" width="200" border="1">

  <tr>

    <td>编号</td>

    <td>姓名</td>

    <td>分数</td>

  </tr>

</table>



<input type="button" value="获取XML中的指定数据"  id="GetXml">

<script type="text/javascript">

function del(nowTr)

{

//多一个parent就代表向前一个标签,

//本删除范围为<td><tr>两个标签,即向前两个parent

//如果多一个parent就会删除整个table

	//$(nowTr).parent().parent().remove();

	var tb =$(nowTr).parentsUntil("tr").remove();

}











</script>



</body>

</html>

<?xml version="1.0" encoding="utf-8"?>

<students>

	<stu>

	<id>a1</id>

	<name>赵</name>

	<c>75</c>

	</stu>

	

	<stu>

	<id>a2</id>

	<name>钱</name>

	<c>90</c>

	</stu>



	<stu>

	<id>a3</id>

	<name>孙</name>

	<c>87</c>

	</stu>

	

	<stu>

	<id>a4</id>

	<name>李</name>

	<c>66</c>

	</stu>

	

	<stu>

	<id>a5</id>

	<name>周</name>

	<c>31</c>

	</stu>

	

	<stu>

	<id>a6</id>

	<name>吴</name>

	<c>78</c>

	</stu>

</students>