<html>
<head>
<title>雙色表格</title>
<style type="text/css">
<!--
table {
border:solid 1px black;
text-align:center;
border-spacing:0px;
}
th,td {
border:solid 1px black;
width:100px;
}
-->
</style>
<script type="text/javascript" >
function color() {
//把表頭設為紫色
var th = document.getElementById("th");
th.style.background = "violet"
//1.得到所有<tr>元素
var trs = document.getElementsByTagName("tr");
var i;
for(i = 1; i <trs.length; i++) {
//2.改變<tr>元素的背景顏色
if(i % 2 == 0) {
trs[i].style.background = "yellow";
} else {
trs[i].style.background = "olive";
}
}
}
window.onload = color;
</script>
</head>
<body>
<center>
<table>
<tr id="th">
<th>姓名</th>
<th>科目</th>
<th>成績</th>
</tr>
<tr>
<td>張三</td>
<td>語文</td>
<td>90</td>
</tr>
<tr>
<td>張三</td>
<td>數學</td>
<td>87</td>
</tr>
<tr>
<td>李四</td>
<td>數學</td>
<td>68</td>
</tr>
<tr>
<td>王五</td>
<td>英語</td>
<td>76</td>
</tr>
</table>
</center>
</body>
</html>
原理其實很簡單：利用getElementsByTagName得到所有的<tr>元素，然后分別為奇數項和偶數項的<tr>元素添加背景顏色。 
