首先我们来看一下实现的效果，如下图所示：
思路：
确定事件: 文档加载完成 onload 2. 事件要触发函数: init() 3. 函数:操作页面的元素 要操作表格中每一行 动态的修改行的背景颜色
具体代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Title</title>
<script >
function init(){
//得到表格
var tab = document.getElementById("tab");
//得到表格中每一行
var rows = tab.rows;
//便利所有的行,然后根据奇数 偶数
for(var i=1; i < rows.length; i++){
var row = rows[i]; //得到其中的某一行
if(i%2==0){
row.bgColor = "yellow";
}else{
row.bgColor = "red"
}
}
}
</script>
</head>
<body onload="init()">
<table border="1px" width="600px" id="tab">
<tr>
<td>
<input type="checkbox"/>
</td>
<td>分类ID</td>
<td>分类名称</td>
<td>分类商品</td>
<td>分类描述</td>
<td>操作</td>
</tr>
<tr>
<td>
<input type="checkbox"/>
</td>
<td>1</td>
<td>手机数码</td>
<td>华为,小米,尼康</td>
<td>黑马数码产品质量最好</td>
<td>
<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a>
</td>
</tr>
<tr>
<td>
<input type="checkbox"/>
</td>
<td>2</td>
<td>成人用品</td>
<td>充气的</td>
<td>这里面的充气电动硅胶的</td>
<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a></td>
</tr>
<tr>
<td>
<input type="checkbox"/>
</td>
<td>3</td>
<td>电脑办公</td>
<td>联想,小米</td>
<td>笔记本特卖</td>
<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a></td>
</tr>
<tr>
<td>
<input type="checkbox"/>
</td>
<td>4</td>
<td>馋嘴零食</td>
<td>辣条,麻花,黄瓜</td>
<td>年货</td>
<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a></td>
</tr>
<tr>
<td>
<input type="checkbox"/>
</td>
<td>5</td>
<td>床上用品</td>
<td>床单,被套,四件套</td>
<td>都是套子</td>
<td><a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >修改</a>|<a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >删除</a></td>
</tr>
</table>
</body>
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