表格隔行变色

<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>表格隔行变色</title>
<style>table {
width: 800px;
margin: 100px auto;
text-align: center;
border-collapse: collapse;
font-size: 14px;
}

thead tr {
height: 30px;
background-color: skyblue;
}

tbody tr {
height: 30px;
}

tbody td {
border-bottom: 1px solid #d7d7d7;
font-size: 12px;
color: blue;
}

.bg {
background-color: #cccccc;
}</style>
</head>

<body>
<table>

<thead>
<tr>
<!-- tr行 th列 -->
<th>代码</th>
<th>名称</th>
<th>最新公布净值</th>
<th>累计净值</th>
<th>前单位净值</th>
<th>净值增长率</th>
</tr>
</thead>

<tbody>
<tr>
<td>003526</td>
<td>农银金穗3个月定期开放债券</td>
<td>1.075</td>
<td>1.079</td>
<td>1.074</td>
<td>+0.047%</td>
</tr>
<tr>
<td>003526</td>
<td>农银金穗3个月定期开放债券</td>
<td>1.075</td>
<td>1.079</td>
<td>1.074</td>
<td>+0.047%</td>
</tr>
<tr>
<td>003526</td>
<td>农银金穗3个月定期开放债券</td>
<td>1.075</td>
<td>1.079</td>
<td>1.074</td>
<td>+0.047%</td>
</tr>
<tr>
<td>003526</td>
<td>农银金穗3个月定期开放债券</td>
<td>1.075</td>
<td>1.079</td>
<td>1.074</td>
<td>+0.047%</td>
</tr>
<tr>
<td>003526</td>
<td>农银金穗3个月定期开放债券</td>
<td>1.075</td>
<td>1.079</td>
<td>1.074</td>
<td>+0.047%</td>
</tr>
<tr>
<td>003526</td>
<td>农银金穗3个月定期开放债券</td>
<td>1.075</td>
<td>1.079</td>
<td>1.074</td>
<td>+0.047%</td>
</tr>
</tbody>

</table>

<script>// 1.获取元素 获取的是 tbody 里面所有的行
var trs = document.querySelector('tbody').querySelectorAll('tr');
// 2. 利用循环绑定注册事件
for (var i = 0; i < trs.length; i++) {

// 3. 鼠标经过事件 onmouseover
trs[i].onmouseover = function () {
// console.log(11);
this.className = 'bg';
}

// 4. 鼠标离开事件 onmouseout
trs[i].onmouseout = function () {
this.className = '';
}
}</script>
</body>

</html>