js鼠标经过表格某行时此行变色 JavaScript实现鼠标经过表格某行时此行变色

时间:2021-01-28 我是Dreamer啊人气:0

表格表头为蓝色，表主体为白色，当鼠标放到表的非表头行时，这一行颜色变为黄色，鼠标离开时黄色消失。

<!DOCTYPE html>
<html lang="zh-CN">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>鼠标经过表格变色</title>
  <style>
    table {
      margin: 200px auto;
      font-size: 12px;
      
      border-collapse: collapse;
      width: 500px;
      height: 50px;
    }
    table thead tr {
      font-size: 14px;
      background-color: skyblue;
    }
    td {
      border: 1px solid black;  
    }
    .bgc{
      background-color: yellow;
    }
  </style>
</head>
<body>
  <table>
    <thead>
      <td>表头1</td>
      <td>表头2</td>
      <td>表头3</td>
    </thead>
    <tbody>
      <tr>
        <td>表格一行一列</td>
        <td>表格一行二列</td>
        <td>表格一行三列</td>
      </tr>
      <tr>
        <td>表格二行一列</td>
        <td>表格二行二列</td>
        <td>表格二行三列</td>
      </tr>
      <tr>
        <td>表格三行一列</td>
        <td>表格三行二列</td>
        <td>表格三行三列</td>
      </tr>
      <tr>
        <td>表格四行一列</td>
        <td>表格四行二列</td>
        <td>表格四行三列</td>
      </tr>
      <tr>
        <td>表格五行一列</td>
        <td>表格五行二列</td>
        <td>表格五行三列</td>
      </tr>
    </tbody>
  </table>
  <script>
    var tr =document.querySelectorAll('tr');
    for(var i = 0;i < tr.length ;i++){
      tr[i].onmouseover = function(){
        this.className = 'bgc';
      }
      tr[i].onmouseout = function(){
        this.className = '';
      }
    }
  </script>
</body>
</html>

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