css set column width

CSS (Cascading Style Sheets) is a language used for web page style design. One of its functions is to set the column width and various styles of tables. We can take advantage of these features to make tables more beautiful and easier to read. This article will introduce how to set the column width of a table through CSS.

First of all, we need to understand the basic structure of HTML tables. A table consists of rows and columns. Each row contains one or more cells, and each cell can contain text, pictures, or other elements. Here is a simple table example:

<table>
  <tr>
    <td>第一列</td>
    <td>第二列</td>
    <td>第三列</td>
  </tr>
  <tr>
    <td>1</td>
    <td>2</td>
    <td>3</td>
  </tr>
  <tr>
    <td>4</td>
    <td>5</td>
    <td>6</td>
  </tr>
</table>

In CSS, we can use the table selector to select the entire table, and the td selector to select each individual table cells. To set the column width, we need to use the width property, whose value can be a pixel value, a percentage, or other units.

If you want to set the column width of each cell to be the same, we can use the table-layout: fixed style to specify the width of each column. For example, if we want to set the width of each column to 120 pixels, the code is as follows:

table {
  table-layout: fixed;
  width: 100%;
}

td {
  width: 120px;
  text-align: center;
  padding: 5px;
}

In the above code, we use the table-layout: fixed style to specify the width of each column The width is a fixed value and sets the width of the entire table to 100%. Then use the td selector to set the width of each cell to 120 pixels, the alignment to center, and the padding to 5 pixels.

If you want to set different column widths, you can use the col element to specify the width of each column. For example, if we want to set the width of the first column to 80 pixels, the width of the second column to 200 pixels, and the width of the third column to be adaptive (that is, automatically adjusted according to the content), the code is as follows:

<table>
  <col width="80px">
  <col width="200px">
  <col>
  <tr>
    <td>第一列</td>
    <td>第二列</td>
    <td>第三列</td>
  </tr>
  <tr>
    <td>1</td>
    <td>2</td>
    <td>这是一列比较长的数据，它会自动调整宽度以适应内容。</td>
  </tr>
  <tr>
    <td>4</td>
    <td>5</td>
    <td>6</td>
  </tr>
</table>

In the above code, we use the col element to specify the width of each column as 80 pixels, 200 pixels and adaptive respectively. The width of the third column is not specified, so its width automatically adjusts to the content.

If you need to change colors every other row, you can use the CSS pseudo-element nth-child to set the color of odd and even rows. For example, set the background color of odd-numbered rows to light gray and the background color of even-numbered rows to white. The code is as follows:

tr:nth-child(even) {
  background-color: #fff;
}

tr:nth-child(odd) {
  background-color: #f2f2f2;
}

To summarize, setting the column width and style of the table through CSS can make the table more beautiful. , easy to read, and improve user experience. The above are some basic methods and techniques for setting table column widths with CSS.

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