表格的基本语法 <table>...</table> - 定义表格
<tr> - 定义表行
<th> - 定义表头
<td> - 定义表元(表格的具体数据) 带边框的表格：
<table border>
<tr><th>Food</th><th>Drink</th><th>Sweet</th>
<tr><td>A</td><td>B</td><td>C</td>
</table>
Food Drink Sweet
A B C
不带边框的表格：
<table>
<tr><th>Food</th><th>Drink</th><th>Sweet</th>
<tr><td>A</td><td>B</td><td>C</td>
</table>
Food Drink Sweet
A B C
跨多行、多列的表元(Table Span)
跨多列的表元 <th colspan=#>
<table border>
<tr><th colspan=3> Morning Menu</th>
<tr><th>Food</th> <th>Drink</th> <th>Sweet</th>
<tr><td>A</td><td>B</td><td>C</td>
</table>
Morning Menu
Food Drink Sweet
A B C
跨多行的表元 <th rowspan=#>
<table border>
<tr><th rowspan=3> Morning Menu</th>
<th>Food</th> <td>A</td></tr>
<tr><th>Drink</th> <td>B</td></tr>
<tr><th>Sweet</th> <td>C</td></tr>
</table>
Morning Menu Food A
Drink B
Sweet C
表格尺寸设置
<table border=#> 边框尺寸设置：
<table border=10>
<tr><th>Food</th><th>Drink</th><th>Sweet</th>
<tr><td>A</td><td>B</td><td>C</td>
</table>
Food Drink Sweet
A B C
<table border width=# height=#> 表格尺寸设置：
<table border width=170 height=100>
<tr><th>Food</th><th>Drink</th><th>Sweet</th>
<tr><td>A</td><td>B</td><td>C</td>
</table>
Food Drink Sweet
A B C
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