实例代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
table,th,td{border:1px solid black;}
th,td{width:100px;padding:5px; text-align:center;}
/*表格边框分离和不显示边框 */
table{border-collapse:separate;
empty-cells:hide;
}
</style>
</head>
<body>
<h1>显示表格的空单元格</h1>
<table >
<tr>
<th>名称</th>
<th>数量</th>
<th>单价</th>
</tr>
<tr>
<td>苹果</td>
<td>200</td>
<td>5</td>
</tr>
<tr>
<td>香蕉</td>
<td></td>
<td>3</td>
</tr>
</table>
</body>
</html>
运行效果：
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