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老师批语：
分页查询的原理与偏移量的计算方法
原理:拿到总页数,然后 / 每页要显示的条数;
偏移量的计算方法: 总页数 / 每页显示的条数,然后向上取整;
2.分页查询的代码:
<?php
//导入分页类
require '9.10inc/Page.php';
use model\Page;
//实例化分页类
$page = new Page();
//连接数据库
$page->connect('mysql','127.0.0.1','php','root','root');
//$con = new PDO('mysql:host=127.0.0.1;dbname=php','root','root');
//获取当前页
$currentPage = $page->getPage('staff');
//获取总页数
$totalPages = $page->getPages('staff');
//获取分页数据
$data = $page->getData('staff');
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link rel="stylesheet" href="./9.10inc/bootstrap/css/bootstrap.css">
<title>框架</title>
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-8 col-md-offset-2">
<table class="table table-bordered table-hover text-center">
<caption class="h3 text-center">员工信息表</caption>
<tr class="info">
<td>ID</td>
<td>姓名</td>
<td>年龄</td>
<td>性别</td>
<td>工资</td>
</tr>
<?php foreach ($data as $row):?>
<tr>
<td><?php echo $row['id']; ?></td>
<td><?php echo $row['name']; ?></td>
<td><?php echo $row['age']; ?></td>
<td><?php echo $row['sex']? '女' :'男'; ?></td>
<td><?php echo $row['salary']; ?></td>
</tr>
<?php endforeach; ?>
</table>
</div>
</div>
<div class="ro">
<div class="col-md-8 col-md-offset-2 text-center">
<nav>
<ul class="pagination">
<li class="disabled"><a href="http://b.cn/9.10demo6.php?p=1" aria-label="Previous"><span aria-hidden="true">«</span></a></li>
<li><a href="http://b.cn/9.10demo6.php?p=1">首页</a></li>
<li><a href="http://b.cn/9.10demo6.php?p=<?php echo (($currentPage-1)==0) ? 1 :($currentPage-1);?>">上一页</a></li>
<!-- 中间页码-->
<?php for($i=1;$i<=$totalPages;$i++):?>
<li class="<?php echo ($i == $currentPage) ? 'active' : '';?>">
<a href="http://b.cn/9.10demo6.php?p=<?php echo $i;?>"><?php echo $i?></a>
</li>
<?php endfor;?>
<li><a href="http://b.cn/9.10demo6.php?p=<?php echo (($currentPage+1)>$totalPages) ? $totalPages :$currentPage+1;?>">下一页</a></li>
<li><a href="http://b.cn/9.10demo6.php?p=<?php echo $totalPages;?>">尾页</a></li>
</ul>
</nav>
</div>
</div>
</div>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<scritp src="./9.10inc/bootstrap/js/bootstrap.js"></scritp>
<scritp src="./9.10inc/bootstrap/js/npm.js"></scritp>
</body>
</html>
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