一.实体字符

在html中，有一些字符不适合直接写出来，如<,>
一般格式：&+实体名;
大于号> &gt     　小于号<&lt  　&符号 &amp  　双引号"" &quot  　人民币符号 &yen

二.表格

 <table> 标签定义 HTML 表格 <th> 表头 <tr> 表格行 <td> 表格列

            <table>
                <th>one</th>
                <th>two</th>
                <th>three</th>
                <th>four</th>
                <tr>
                    <td>1</td>
                    <td>2</td>
                    <td>3</td>
                    <td>4</td>
                </tr>
                <tr>
                    <td>5</td>
                    <td>6</td>
                    <td>7</td>
                    <td>8</td>
                </tr>
                <tr>
                    <td>9</td>
                    <td>10</td>
                    <td>11</td>
                    <td>12</td>
                </tr>
                <tr>
                    <td>12</td>
                    <td>14</td>
                    <td>15</td>
                    <td>16</td>
                </tr>
            </table>

显示效果:

数表.png

给td添加边框：

td{    border: 1px solid red;
}

显示效果:

带边框的数表.png

然而这并不是我们想要的！
让相邻的边框融合：

table{    border-collapse: collapse;
}

显示效果:

完整数表.png

其他情况：

1.colspan  横向融合

值为数字，表示横向融合几格

            <table>
                <tr>
                    <th>one</th>
                    <th>two</th>
                    <th>three</th>
                </tr>
                <tr>
                    <td colspan="3">1</td>
                    
                </tr>
                <tr>
                    <td>4</td>
                    <td>5</td>
                    <td>6</td>
                </tr>
            </table>

显示效果:

横向融合表格.png

2.rowspan  纵向融合

值为数字，表示纵向融合几格

              <table>
                <tr>
                    <th>one</th>
                    <td rowspan="2">1</td>
                    <td>2</td>
                    <td>3</td>
                </tr>
                <tr>
                    <th>two</th>
                    <td>5</td>
                    <td>6</td>
                </tr>
                <tr>
                    <th>three</th>
                    <td>7</td>
                    <td>8</td>
                    <td>9</td>
                </tr>
            </table>

显示效果：

纵向融合表格.png

作者：JustinPenChia
链接：https://www.jianshu.com/p/21f06ad880f6