Html Table 固定或自定义列宽度demo效果

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style>
    td {
      white-space: nowrap;
      overflow: hidden;
      width: 200px;
    }
    table {
      table-layout: fixed;
    }
  </style>
</head>
<body>
  <table bgcolor="green" width="100%">
    <tr bgcolor="white">
        <td>123121212121212121212121212</td>
        <td>123</td>
        <td>123</td>
        <td>123</td>
    </tr>
    <tr bgcolor="white">
        <td>123123123123123123123123123123123123123123123123123123123</td>
        <td>123</td>
        <td>123</td>
        <td>123</td>
    </tr>
    <tr bgcolor="white">
        <td>123</td>
        <td>123</td>
        <td>123</td>
        <td>123</td>
    </tr>
    <tr bgcolor="white">
        <td>345</td>
        <td>345</td>
        <td>345</td>
        <td>345</td>
    </tr>
  </table>
</body>
</html>

demo 效果