Message pagination design

1, modify the message.php code:

<?php
var page=1;
            var num=4;
//            var str="";
            function load(page){
                function showpage() {
                    //获取总页数
                    $.ajax({
                        async:false,//设置成同步 函数内部变量 外部可以取到
                        type:'get',
                        url:'totaldb.php',
                        data:{page:page,num:num},
                        dataType:'text',
                        success: function(data,status)
                        {
                            totalpage=data;
                        }
                    })
                    var result="";
                    //显示分页
                    result="<input type='button' id='prev' value='上一页'></input>";
                    result+='当前页：第'+page+'页/总共：'+totalpage+"页";
                    result+="<input type='button' id='next'value='下一页'></input>";
                    $('#page').html(result);
                    //单击下一页 page递增 实现翻页
                    $('#next').click(function(){
                        page++;
                        if(page>=totalpage)
                        {
                            page=totalpage;
                        }
                        load(page);
                    })
                    //单击上一页 page递减 实现翻页
                    $('#prev').click(function(){
                        page--;
                        if(page<=1)
                        {
                            page=1;
                        }
                        load(page);
                    })
                }
                       //获取内容
                  var str="";
                  $.ajax({
                       type:'get',
                       url:'messageshowdb.php',
                       data:{page:page,num:num},
                       dataType:'json',
                       success: function(data,status)
                       {
                           str="";
                            $.each(data, function(key,value) {
                  str+="<div>"+[key]+":"+"标题:"+value.title+"-----"+"内容:"+value.content+"</div>";
                                  $("#div1").html(str);
               });
                       }
                   })
       showpage();
            }

2, create a new totaldb.php file

The code is as follows:

<?php
include 'mysqli.php';
$num=$_GET["num"];//每页显示的个数
$sql="select * from message";
$result=$mysqli->query($sql);
$totalnum=$result->num_rows;//总记录数
$totalpage=ceil($totalnum/$num);
echo $totalpage;

3, modify messageshowdb.php

<?php
include 'mysqli.php';
$page= isset($_GET["page"])?$_GET["page"]:1;
$num=$_GET["num"];
$startnum=($page-1)*$num; //开始位置
$con=isset($_GET["con"])?$_GET["con"]:"";//搜索关键字
$content=isset($_GET["content"])?$_GET["content"]:"";
$sql="select * from message where 1=1";
$result=$mysqli->query($sql);
if($result->num_rows>0)
{
    while ($row=$result->fetch_assoc())
    {
        $arr[$row["id"]]["title"]=$row["title"];//$arr[1]["title"]=$row["title"]
        $arr[$row["id"]]["content"]=$row["content"];//$arr[1]["content"]=$arr["content"]
    }
}
echo json_encode($arr);

4, add paging loading page

5, effect display