鼠标经过事件不起作用
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<script type="text/javascript">
window.onload = function(){
var trs = document.getElementsByTagName("tr");
for (var i = 0; i < trs.length; i++) {
background(trs[i]);
}
}
function background(object){
object.onmouseover = function(){
object.style.backgroundColor = #f2f2f2;
}
object.onmouseout = function(){
object.style.backgroundColor = #fff;
}
}
var num = 2;
function addone(){
num++;
var tr = document.createElement("tr");
var td1 = document.createElement("td");
var td2 = document.createElement("td");
var td3 = document.createElement("td");
var table = document.getElementById("table");
table.lastChild.appendChild(tr);
tr.appendChild(td1);
tr.appendChild(td2);
tr.appendChild(td3);
td1.innerHTML = "xh00" + num;
td2.innerHTML = "第" + num +"位同学";
td3.innerHTML = "<a href = 'javascript:;' onclick='del(this)'>删除</a>"
}
// 创建删除函数
function del(object){
var tr = object.parentNode.parentNode;
tr.parentNode.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> <!--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:;" onclick="del(this)" >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 = "addone()" /> <!--在添加按钮上添加点击事件 -
</body>
</html>
