<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>原生js实现各行变色</title>
<style>
*{
margin:0;
padding:0;
}
#studentCore{
width:300px;
margin:0 auto;
}
table{
border-collapse: collapse;
}
td,th{
text-align: center;
padding:3px 5px;
border:1px solid #ccc;
}
th{
background-color: lightsteelblue;
}
.hightLight{
background-color: pink;
}
</style>
</head>
<body onload="setTableColor()">
<div id="studentCore">
<table>
<thead>
<tr>
<th>Sname</th>
<th>Score</th>
</tr>
</thead>
<tbody>
<tr>
<td>明明</td>
<td>50</td>
</tr>
<tr>
<td>静静</td>
<td>60</td>
</tr>
<tr>
<td>日日</td>
<td>65</td>
</tr>
<tr>
<td>李磊</td>
<td>70</td>
</tr>
<tr>
<td>韩梅梅</td>
<td>75</td>
</tr>
<tr>
<td>杨幂</td>
<td>80</td>
</tr>
<tr>
<td>范冰冰</td>
<td>85</td>
</tr>
</tbody>
</table>
</div>
<script src="js/jquery-3.2.1.min.js"></script>
<!--方法一-->
<script>
var data=document.getElementById("studentCore");
var trs=data.querySelectorAll("tbody>tr");
console.log(trs);
for (var i=0;i<trs.length;i++){
i%2!=0&&(trs[i].className="hightLight");
}
</script>
<!--方法二-->
<script>
function setTableColor() {
var data=document.getElementById("studentCore");
var trs=data.getElementsByTagName("tr");
for(var i=0;i<trs.length;i++){
var j=i+1;
if(j%2==0){
trs[i].style.background="pink";
}else{
trs[i].style.background="yellow";
}
}
}
setTableColor();
</script>
</body>
</html>
原文：http://www.cnblogs.com/yingleiming/p/7802772.html