php+ajax无刷新分页实例详解

 <title>ajax分页演示</title><div id="result"> <?php $db=mysql_connect("localhost","root","123456"); mysql_select_db("register"); mysql_query("set names 'utf-8'"); $result=mysql_query("select * from user"); $total=mysql_num_rows($result) or die(mysql_error()); $page=isset($_GET['page'])?intval($_GET['page']):1; $page_size=5; $url='ajax_page_show_userinfo.php'; $pagenum=ceil($total/$page_size); $page=min($pagenum,$page); $prepage=$page-1; $nextpage=($page==$pagenum?0:$page+1); $pageset=($page-1)*$page_size; $pagenav.="显示第".($total?($pageset+1):0)."-".min($pageset+5,$total)."记录 共<b>".$total."</b>条记录 现在是第 <b>".$page."</b> 页 "; if($page$pagenum){ echo "error:没有此页".$page; exit(); } ?> <table align="center" border="2" width="300"> <tr bgcolor="#cccccc" align="center"> <td>用户名</td><td>用户密码</td></tr>  <tr align="center"> <td></td><td></td></tr>  </table> <?php echo "<p align="center">$pagenav</p>"; ?> </div>

 var http_request=false; function send_request(url){//初始化，指定处理函数，发送请求的函数 http_request=false; //开始初始化XMLHttpRequest对象 if(window.XMLHttpRequest){//Mozilla浏览器 http_request=new XMLHttpRequest(); if(http_request.overrideMimeType){//设置MIME类别 http_request.overrideMimeType("text/xml"); } } else if(window.ActiveXObject){//IE浏览器 try{ http_request=new ActiveXObject("Msxml2.XMLHttp"); }catch(e){ try{ http_request=new ActiveXobject("Microsoft.XMLHttp"); }catch(e){} } } if(!http_request){//异常，创建对象实例失败 window.alert("创建XMLHttp对象失败！"); return false; } http_request.onreadystatechange=processrequest; //确定发送请求方式，URL，及是否同步执行下段代码 http_request.open("GET",url,true); http_request.send(null); } //处理返回信息的函数 function processrequest(){ if(http_re<a style="color:transparent">来源gao*daima.com搞@代#码网</a>quest.readyState==4){//判断对象状态 if(http_request.status==200){//信息已成功返回，开始处理信息 document.getElementByIdx(reobj).innerHTML=http_request.responseText; } else{//页面不正常 alert("您所请求的页面不正常！"); } } } function dopage(obj,url){ //document.getElementByIdx(obj).innerHTML="正在读取数据..."; send_request(url); reobj=obj; }