简单实现Ajax无刷新分页效果

!doctype html>
html lang="en">
head>
 meta charset="UTF-8">
 title>Ajax无刷新分页效果/title>

 script type="text/javascript">
 function showpage(url) {
  var xhr = new XMLHttpRequest();
  xhr.onreadystatechange = function () {
  if (xhr.readyState == 4) {
   document.getElementById("result").innerHTML = xhr.responseText;
  }
  }

  xhr.open('get',url);
  xhr.send(null);
 }

 window.onload = function () {
  showpage('page.php');
 }
 /script>
/head>
body>
  h2 style="text-align: center">Ajax无刷新分页效果/h2>
  div id="result">/div>
/body>
/html>

/*
* Created on 2011-07-28
* Author : LKK , http://lianq.net
* 使用方法：
require_once('mypage.php');
$result=mysql_query("select * from mytable", $myconn);
$total=mysql_num_rows($result); //取得信息总数
pageDivide($total,10); //调用分页函数

//数据库操作
$result=mysql_query("select * from mytable limit $sqlfirst,$shownu", $myconn);
while($row=mysql_fetch_array($result)){
...您的操作
}
echo $pagecon; //输出分页导航内容
*/

//if(!function_exists("pageDivide")){
#$total 信息总数
#$shownu 显示数量,默认20
#$url 本页链接
 function pageDivide($total,$shownu=20,$url=''){

#$page 当前页码
#$sqlfirst mysql数据库起始项
#$pagecon 分页导航内容
 global $page,$sqlfirst,$pagecon,$_SERVER;
 $GLOBALS["shownu"]=$shownu;

 if(isset($_GET['page'])){
  $page=$_GET['page'];
 }else $page=1;

#如果$url使用默认,即空值,则赋值为本页URL
 if(!$url){ $url=$_SERVER["REQUEST_URI"];}

#URL分析
 $parse_url=parse_url($url);
 @$url_query=$parse_url["query"]; //取出在问号?之后内容
 if($url_query){
  $url_query=preg_replace("/(?)(page=$page)/","",$url_query);
  $url = str_replace($parse_url["query"],$url_query,$url);
  if($url_query){
  $url .= "page";
  }else $url .= "page";
 }else $url .= "?page";

#页码计算
 $lastpg=ceil($total/$shownu); //最后页,总页数
 $page=min($lastpg,$page);
 $prepg=$page-1; //上一页
 $nextpg=($page==$lastpg ? 0 : $page+1); //下一页
 $sqlfirst=($page-1)*$shownu;

#开始分页导航内容
 $pagecon = "显示第 ".($total?($sqlfirst+1):0)."-".min($sqlfirst+$shownu,$total)." 条记录，共 B>$total/B> 条记录";
 if($lastpg=1) return false; //如果只有一页则跳出

// if($page!=1) $pagecon .=" a href='$url=1'>首页/a> "; else $pagecon .=" 首页 ";
// if($prepg) $pagecon .=" a href='$url=$prepg'>前页/a> "; else $pagecon .=" 前页 ";
// if($nextpg) $pagecon .=" a href='$url=$nextpg'>后页/a> "; else $pagecon .=" 后页 ";
// if($page!=$lastpg) $pagecon.=" a href='$url=$lastpg'>尾页/a> "; else $pagecon .=" 尾页 ";

 if($page!=1) $pagecon .=" a href='javascript:showpage(\"$url=1\")'>首页/a> "; else $pagecon .=" 首页 ";
 if($prepg) $pagecon .=" a href= 'javascript:showpage(\"$url=$prepg\")'>前页/a> "; else $pagecon .=" 前页 ";
 if($nextpg) $pagecon .=" a href= 'javascript:showpage(\"$url=$nextpg\")'>后页/a> "; else $pagecon .=" 后页 ";
 if($page!=$lastpg) $pagecon.=" a href= 'javascript:showpage(\"$url=$lastpg\")'>尾页/a> "; else $pagecon .=" 尾页 ";

#下拉跳转列表,循环列出所有页码
// $pagecon .="　到第 select name='topage' size='1' onchange='window.location=\"$url=\"+this.value'>\n";
 $pagecon .="　到第 select name='topage' size='1' onchange='showpage(\"$url=\"+this.value)'>\n";
 for($i=1;$i=$lastpg;$i++){
  if($i==$page) $pagecon .="option value='$i' selected>$i/option>\n";
  else $pagecon .="option value='$i'>$i/option>\n";
 }
 $pagecon .="/select> 页，共 $lastpg 页";

 return $page;
 }
//}else die('pageDivide()同名函数已经存在!');

?php

 header("Content-type:text/html; charset=utf-8");
 $link = mysqli_connect('localhost','root','123','good');
if (!$link)
{
 die("连接错误: " . mysqli_connect_error());
}

$sql = "SELECT * FROM ecs_category";
$qry = mysqli_query($link,$sql);
$total = mysqli_num_rows($qry);
$per = 10;

$page = pageDivide($total,$per);

$sql = "SELECT cat_id,cat_name FROM category limit $sqlfirst,$shownu";
 $result = mysqli_query($link,$sql);

 //$goods = mysqli_fetch_all($result,MYSQLI_ASSOC);

 //mysqli_free_result($result);

echo eof
 style type="text/css">
 table{width:500px;margin:auto;border: 1px solid black; border-collapse:collapse;text-align:center;}
 td{border: 1px solid black;}
 /style>
 table>
  tr>td>序号/td>td>商品编号/td>td>商品类型/td>/tr>
eof;

 $num = ($page - 1) * $per;
// foreach ($goods as $k => $v) {
 while($goods = mysqli_fetch_assoc($result)){
 echo "tr>";
 echo "td>".++$num."/td>";
 echo "td>$goods[cat_id]/td>";
 echo "td>$goods[cat_name]/td>";
 echo "/tr>";
 }

 echo "tr>td colspan='3'>$pagecon/td>/tr>";
 echo "/table>";