连续使用两个parentNote以后，出现问题：Uncaught TypeError: Cannot read properties of undefined (reading 'parentNode')
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>添加删除记录练习</title>
<link rel="stylesheet" type="text/css" href="./ex_2_style/css.css"/>
<script type="text/javascript">
window.onload = function(){
var allAs = document.getElementsByTagName("a");
for(var i= 0;i < allAs.length;i++){
allAs[i].onclick = function(){
var trs = this.parentNote.parentNode;
confirm("确认删除吗？");
trs.parentNode.removeChild(trs);
return false;
};
}
};
</script>
</head>
<body>
<table id="employeeTable">
<tr>
<th>Name</th>
<th>Emali</th>
<th>Salary</th>
<th>&nbps;</th>
</tr>
<tr>
<td>Draco</td>
<td>droco@droco.com</td>
<td>10000</td>
<td><a href="javascript:;">Delete</td>
</tr>
<tr>
<td>Harry</td>
<td>harry@harry.com</td>
<td>6000</td>
<!-- deleteEmp?id=002 -->
<td><a href="javascript:;">Delete</td>
</tr>
<tr>
<td>Sherlock</td>
<td>sherlock@sherlock.com</td>
<td>8000</td>
<td><a href="javascript:;">Delete</td>
</tr>
</table>
<div id="formDiv">
<h4>添加新员工</h4>
<table >
<tr>
<td class="word">name:</td>
<td class="inp"><input type="text" name="empName" id="empName" value="" /></td>
</tr>
<tr>
<td class="word">email:</td>
<td class="inp"><input type="text" name="email" id="email" value="" /></td>
</tr>
<tr>
<td class="word">salary:</td>
<td class="inp"><input type="text" name="salary" id="salary" value="" /></td>
</tr>
<tr>
<td colspan="2" align="center">
<button type="button" id="addEmpButton" value="abc">
Submit
</button>
</td>
</tr>
</table>
</div>
</body>
</html>
用谷歌浏览器打开后，点击delete按钮以后就会出现：
求帮看一下问题所在
