基于JavaScript实现表格隔行换色

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表格隔行换色

需求分析

我们商品分类的信息太多，如果每一行都显示同一个颜色的话会让人看的眼花，为了提高用户体验，减少用户看错的情况，需要对表格进行隔行换色

技术分析

table对象集合 cells[]：返回包含表格中所有单元格的一个数组。 rows[]：返回包含表格中所有行的一个数组。 tBodies[]：返回包含表格中所有tbody 的一个数组。

步骤分析

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
代码实现

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

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JavaScript,表格,隔行换色

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