使用jquery获取当前行

<script type="text/javascript" src="js/jquery-1.3.2.js">
</script><script>function deletenode(n){ alert("开始");
var node_id=$("#tbNodeList tr:eq(" + n + ") td:first-child").text();
 alert(node_id);
 alert("结束");
}
</script>
<table id="tbNodeList">
 <tr onclick="deletenode(this.rowIndex)">
<td>1</td>
</tr>
 <tr onclick="deletenode(this.rowIndex)">
<td>2</td>
</tr>
<tr onclick="deletenode(this.rowIndex)">
<td>3</td>
</tr>
<tr onclick="deletenode(this.rowIndex)">
<td>4</td>
</tr>
</table>