遇到瓶颈了，删除任意删除实在是搞不来，求大神帮我看看吧
<!DOCTYPE html>
<html>
<head>
<title> new document </title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<script type="text/javascript">
window.onload = function(){ changeColor(); }
function changeColor(){
var trc = document.getElementsByTagName("tr");
for (var i = 0; i <=trc.length; i++) {
trc[i].style.backgroundColor="#fff";
trc[i].setAttribute("onmouseover","this.style.backgroundColor='#f2f2f2'");
trc[i].setAttribute("onmouseout","this.style.backgroundColor='#fff'");
}
}
function add() {
var tb = document.getElementById("table");
var newLow = document.createElement("tr");
var c = document.createElement("td");
var d = document.createElement("td");
var f = document.createElement("td");
var co = document.createTextNode("");
var a = document.createElement("a");
a.innerHTML = "删除";
a.href ="javascript:delrow()";
c.appendChild(co);
d.appendChild(co);
f.appendChild(a);
newLow.appendChild(c);
newLow.appendChild(d);
newLow.appendChild(f);
tb.appendChild(newLow);
changeColor();
}
function delrow(){
var tbody = document.getElementById('table');
tbody.removeChild(tbody.lastChild);
}//向这边，我很想知道点击这一行的删除，能否准确定位到当前的chilidNodes【i】的方法。有没有类似指针的东西
//好确定此时的位置
</script>
</head>
<body>
<table border="1" width="50%" id="table">
<tr onclick="on()">
<th>学号</th>
<th>姓名</th>
<th>操作</th>
</tr>
<tr>
<td>xh001</td>
<td>王小明</td>
<td><a href="javascript:delrow();" >删除</a></td> <!--在删除按钮上添加点击事件 -->
</tr>
<tr>
<td>xh002</td>
<td>刘小芳</td>
<td><a href="javascript:delrow();" >删除</a></td> <!--在删除按钮上添加点击事件 -->
</tr>
</table>
<input type="button" value="添加一行" onclick="add()" /> <!--在添加按钮上添加点击事件 -->
</body>
</html>
