align有三个属性：
1、居中：center；
2、靠左：left；
3、靠右：right。
html中是没办法实现上下居中的，如果设置上下居中，需要通过js程序来设置。
左右居中代码如下：
<!DOCTYPE html PUBLIC "-//W3C//<a href="https://www.baidu.com/s?wd=DTD&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1d9mWwWuWR4rHbzmyDYnjbY0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3En1R4PH0LnjTv" target="_blank" class="baidu-highlight">DTD</a>XHTML 1.0 <a href="https://www.baidu.com/s?wd=Tr&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1d9mWwWuWR4rHbzmyDYnjbY0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3En1R4PH0LnjTv" target="_blank" class="baidu-highlight">Tr</a>ansitional//EN" "http://www.w3.org/<a href="https://www.baidu.com/s?wd=TR&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1d9mWwWuWR4rHbzmyDYnjbY0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3En1R4PH0LnjTv" target="_blank" class="baidu-highlight">TR</a>/xhtml1/<a href="https://www.baidu.com/s?wd=DTD&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1d9mWwWuWR4rHbzmyDYnjbY0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3En1R4PH0LnjTv" target="_blank" class="baidu-highlight">DTD</a>/xhtml1-<a href="https://www.baidu.com/s?wd=tr&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1d9mWwWuWR4rHbzmyDYnjbY0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3En1R4PH0LnjTv" target="_blank" class="baidu-highlight">tr</a>ansitional.<a href="https://www.baidu.com/s?wd=dtd&tn=44039180_cpr&fenlei=mv6quAkxTZn0IZRqIHckPjm4nH00T1d9mWwWuWR4rHbzmyDYnjbY0ZwV5Hcvrjm3rH6sPfKWUMw85HfYnjn4nH6sgvPsT6KdThsqpZwYTjCEQLGCpyw9Uz4Bmy-bIi4WUvYETgN-TLwGUv3En1R4PH0LnjTv" target="_blank" class="baidu-highlight">dtd</a>">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/htmlcharset=utf-8" />
<title>无标题文档</title>
</head>
<body>
<table width="400" height="400" border="1" align="center">
<tr align="center" valign="middle">
<td>居中</td>
<td>居中</td>
<td>居中</td>
</tr>
<tr align="center" valign="middle">
<td>居中</td>
<td>居中</td>
<td>居中</td>
</tr>
</table>
</body>
</html>
让html表格文字居中居左，有两种方法：
第一种方法：是表格自身的属性，如下代码：
<table width="100%" border="1">
<tr>
<td colspan="2">求职意向</td>
</tr>
<tr>
<td width="27%" align="center" valign="middle">求职类型</td>
<td width="73%" align="left" valign="middle">网站设计(前，后台)</td>
</tr>
<tr>
<td align="center" valign="middle">求职月薪</td>
<td align="left" valign="middle">2500以上</td>
</tr>
<tr>
<td align="center" valign="middle">希望职业</td>
<td align="left" valign="middle">前台美工</td>
</tr>
<tr>
<td align="center" valign="middle">希望职位</td>
<td align="left" valign="middle">暂无</td>
</tr>
<tr>
<td align="center" valign="middle">希望地区</td>
<td align="left" valign="middle">西安</td>
</tr>
</table>
第二种方法：用样式控制
<table width="100%" border="1">
<tr>
<td colspan="2">求职意向</td>
</tr>
<tr>
<td width="27%" align="center" valign="middle">求职类型</td>
<td width="73%" style="padding-left:20px">网站设计(前，后台)</td>
</tr>
<tr>
<td align="center" valign="middle">求职月薪</td>
<td style="padding-left:20px">2500以上</td>
</tr>
<tr>
<td align="center" valign="middle">希望职业</td>
<td style="padding-left:20px">前台美工</td>
</tr>
<tr>
<td align="center" valign="middle">希望职位</td>
<td style="padding-left:20px">暂无</td>
</tr>
<tr>
<td align="center" valign="middle">希望地区</td>
<td style="padding-left:20px">西安</td>
</tr>
</table>
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