$(function() {

	//初始化

	getData(0);

	var index = 1;

	$("#more").click(function() {

		getData(index)

		index = index + 1;

	})

	var cur_page = 1;

	var total, total_page, page_size;

	//ajax交互

	function getData(pageIndex) {

		$.ajax({

			type: "POST",

			url: "test.php",

			data: {

				"pageIndex": pageIndex

			}, //传递参数，作为后台返回页码的依据

			dataType: "json", //预期返回的数据为json

			beforeSend: function() {

				$("#more").text("正在加载中...")

			},

			success: function(json) { //成功获取数据后，返回json对象，这是一个json的名，以我的理解是json={。。。}

				$("#more").text("加载更多...");

				total = json.total; //获取json中的total属性值

				pageSize = json.pageSize; //获取json中的pageSize属性值

				totalPage = json.totalPage;

				var list = json.list; //json中的list是一个数组

				var li = "";

				$.each(list, function(index, content) { //遍历list数组，index是下标，content是这个下标对应的值

					li += "<ul><li class='question'>" + content['question'] + "</li><li class='answer'>" + content['answer'] + "</li></ul>";

				});

				$("#list").append(li);

				if (index >= totalPage) {

					$("#more").text("没有了").css("background", "#555").unbind("click"); //取消绑定click事件

				}

			},

			error: function() {

				alert("加载错误");

			}

		})

	}

})

<?php

include_once('conn.php');

$page = intval($_POST['pageIndex']);//接收前台发送的数据

if(!empty($page)){

	$result = mysql_query("select id from test1");

	$total = mysql_num_rows($result);//总记录数

	$pageSize = 3; //每页显示数

	$totalPage = ceil($total/$pageSize); //总页数

	$startPage = $page*$pageSize;

	$arr['total'] = $total;

	$arr['pageSize'] = $pageSize;

	$arr['totalPage'] = $totalPage;

	$query = mysql_query("select id,question,answer from test1 order by id asc limit $startPage,$pageSize");

	while($row=mysql_fetch_array($query)){//获取所有数据行

		$arr['list'][] = array(

			'id' => $row['id'],//把行中id字段的值赋值给id

			'question' => $row['question'],

			'answer' => $row['answer'],

		);

	}

	mysql_query('SET NAMES UTF8');

	header("Content-Type:text/html;charset = utf-8");

	echo json_encode($arr);//转为为json格式，这里输出的字符格式与前台无关

}

?>