使用HTML表格時，合併單元格的正確方法是通過colspan和rowspan屬性。 1. colspan用於橫向合併列，設置一個單元格跨越多個列，適用於創(chuàng)建覆蓋多列的標題；2. rowspan用於縱向合併行，使單元格向下延伸多行，適合用於統(tǒng)一分類標籤；3. 可同時使用colspan和rowspan實現(xiàn)複雜佈局，但需提前規(guī)劃結構並註意空間佔用，避免重疊混亂。合理運用這兩個屬性可提升表格組織性，但應保持結構簡潔以減少維護難度。

If you're working with HTML tables and need to merge cells across rows or columns, colspan and rowspan are the right tools. These attributes let you control how many columns or rows a single cell spans, which is useful for organizing data more clearly or creating complex table layouts.

What colspan Does (and How to Use It)

The colspan attribute tells a table cell ( <td> or <code><th> ) how many columns it should span. This is handy when you want one cell to stretch across multiple columns, like when creating headers that cover several data columns.<p> For example:</p><pre class='brush:php;toolbar:false;'> &lt;table border=&quot;1&quot;&gt; &lt;tr&gt; &lt;th colspan=&quot;2&quot;&gt;Personal Information&lt;/th&gt; &lt;th&gt;Contact&lt;/th&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;John&lt;/td&gt; &lt;td&gt;Doe&lt;/td&gt; &lt;td&gt;john@example.com&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt;</pre><p> Here, the header "Personal Information" covers two columns, so the name fields fall under it.</p><ul><li> Just set <code>colspan="X" where X is the number of columns to span.

Understanding rowspan (Spanning Downward)

While colspan stretches a cell horizontally, rowspan does the opposite—it makes a cell extend down through multiple rows. This is often used when a piece of data applies to multiple rows, like a category label in a grouped list.

Example:

 <table border="1">
  <tr>
    <th rowspan="2">Fruits</th>
    <td>Apple</td>
  </tr>
  <tr>
    <td>Banana</td>
  </tr>
</table>

In this case, the word "Fruits" appears once but spans both rows.

• Set rowspan="Y" on the cell you want to stretch.
• The following Y–1 rows should skip that column since it's already occupied.
• This can get tricky if you have multiple merged cells overlapping—plan your layout carefully.

Combining Colspan and Rowspan

Sometimes you'll need both attributes on the same cell. For instance, in a dashboard-style table, a title might span both columns and rows.

Example:

 <table border="1">
  <tr>
    <td rowspan="2" colspan="2">Top Left</td>
    <td>Right 1</td>
  </tr>
  <tr>
    <td>Right 2</td>
  </tr>
</table>

When combining them:

• Think ahead about how many rows and columns each section will take.
• Make sure the surrounding cells don't try to fill in spaces that are already covered by merged ones.
• It helps to sketch out the layout on paper or with comments before coding it.

Merging table cells with colspan and rowspan gives you flexibility, but it also adds complexity. Keep your structure as simple as possible to avoid confusion later. If things start looking messy, it might be worth rethinking the layout or splitting the table into smaller parts.

基本上就這些。

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