表格

<h1>纵向合并  rowspan的作用纵向跨越的列数</h1>
    <table border="1" width="600" height="30" cellpadding="0" cellspacing="0">
        <tr>
            <td rowspan="3">单元格1</td>
            <td>单元格2</td>
        </tr>
        <tr>
            <td>单元格3</td>
        </tr>
        <tr>
            <td>单元格4</td>
        </tr>
    </table>

图片.png

<h2>跨列合并colspan的作用横向跨越的列数</h2>
    <table border="1" width="600" height="30" cellpadding="0" cellspacing="0">
        <tr>
            <td colspan="3">单元格2</td>
        </tr>
        <tr>
            <td>单元格2</td>
            <td>单元格3</td>
            <td>单元格4</td>
        </tr>
        <tr>
            <td>单元格2</td>
            <td>单元格3</td>
            <td>单元格4</td>
        </tr>
    </table> 

图片.png

<table border="1" width="600" height="200" cellpadding="0" cellspacing="0">
        <tr>
            <td colspan="4"></td>
        </tr>
        <tr>
            <td></td>
            <td></td>
            <td></td>
            <td></td>
        </tr>
        <tr>
            <td rowspan="2"></td>
            <td></td>
            <td></td>
            <td></td>
        </tr>
        <tr>
            <td></td>
            <td rowspan="3"></td>
            <td></td>
        </tr>
        <tr>
            <td colspan="2"></td>
            <td></td>
        </tr>
        <tr>
            <td></td>
            <td></td>
            <td></td>
        </tr>
    </table>

视图如下：

图片.png