<!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(){
var trs = document.getElementsByTagName('tr');
for(var i = 1; i < trs.length; i++){
trs[i].onmouseover = function(){
this.style.backgroundColor = "#f2f2f2";
}
trs[i].onmouseout = function(){
this.style.backgroundColor = "#fff";
}
}
}
function add(){
var table=document.getElementById("table").lastChild;
var tr=document.createElement("tr");
var td=document.createElement("td");
td.innerHTML="<input type="text"/>";
tr.appendChild(td);
var td=document.createElement("td");
td.innerHTML="<input type="text"/>";
tr.appendChild(td);
var td=document.createElement("td");
td.innerHTML="<a href="#" onclick = "del(this);">删除</a>";
tr.appendChild(td);
table.appendChild(tr);
}
function del(obj){
var tbody=document.getElementById("table").lastChild;
var tr=obj.parentNode.parentNode;
tbody.removeChild(tr);
}
</script>
</head>
<body>
<table border="1" width="50%" id="table">
<tr>
<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:;"onclick="del(this);">删除</a></td>
</tr>
<tr>
<td>xh002</td>
<td>刘小芳</td>
<td><a href="javasript:;" onclick = "del(this);" >删除</a></td>
</tr>
</table>
<input type="button" value="添加一行" onclick = "add();"/>
</body>
</html>
