AJAX：
AJAX 是一种用于创建快速动态网页的技术。
通过在后台与服务器进行少量数据交换，AJAX 可以使网页实现异步更新。这意味着可以在不重新加载整个网页的情况下，对网页的某部分进行更新。
如果此页面用到了ajax方法，一定要在页面上端加上：
<script src="../../jquery-1.11.2.min.js"></script>
ajax基础语法：
<script type="text/javascript">
$.ajax({
url:"chuli.php", //处理页面地址
data:{code:"n001"},//传递的数据，提交数据
type:"POST", //提交方式，一般用POST，大写
dataType:"TEXT", //返回值的类型，TEXT要大写
success:function(data){ //回调函数
alert(data);//输出返回的值
},
error:function(){ //处理出错执行 } });
</script>
ajax做登录：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../../jquery-1.11.2.min.js"></script>
<title>无标题文档</title>
</head> <body>
<div>用户名：<input type="text" id="uid" /></div>
<div>密码：<input type="text" id="pwd" /></div>
<div><input type="button" value="登录" id="btn" /></div>
</body>
<script type="text/javascript">
$(document).ready(function(e) {
$("#btn").click(function(){
//取用户名和密码
var u = $("#uid").val();
var p = $("#pwd").val();
//调AJAX
$.ajax({
url:"dlchuli.php",
data:{u:u,p:p},
type:"POST",
dataType:"TEXT",
success: function(data){
if(data.trim()=="OK")
{
window.location.href="main.php";
}
else
{
alert("用户名或密码有误");
}
}
});
})
});
</script>
</html>
<?php
$uid = $_POST["u"];
$pwd = $_POST["p"]; include("../DBDA.class.php");
$db = new DBDA(); $sql = "select pwd from users where uid='{$uid}'"; $mm = $db->StrQuery($sql); if($mm == $pwd && $pwd!="")
{
echo "OK";
}
else
{
echo "NO";
}
ajax用户名验证
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../../jquery-1.11.2.min.js"></script>
<title>无标题文档</title>
</head> <body> <input type="text" id="uid" />
<span id="ts"></span> </body>
<script type="text/javascript">
$("#uid").blur(function(){
//取用户名
var uid = $("#uid").val();
//调AJAX
$.ajax({
url:"uidchuli.php",
data:{u:uid},
type:"POST",
dataType:"TEXT",
success: function(data){
if(data>0)
{
$("#ts").html("该用户名已存在");
$("#ts").css("color","red");
}
else
{
$("#ts").html("该用户名可用");
$("#ts").css("color","green");
}
}
});
})
</script>
</html>
<?php
$uid = $_POST["u"]; include("../DBDA.class.php");
$db = new DBDA(); $sql = "select count(*) from users where uid='{$uid}'"; echo $db->StrQuery($sql);
ajax做关键字查询动态显示
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../../jquery-1.11.2.min.js"></script>
<title>无标题文档</title>
<style type="text/css">
*{ margin:0px auto; padding:0px}
.l{ width:200px; height:30px; text-align:center; line-height:30px; vertical-align:middle; border-bottom:1px solid #60F}
</style>
</head> <body> <br /> <div style="width:200px; height:35px;border:2px solid #60F"><input style="width:196px; height:31px;" type="text" id="name" /></div> <div id="list" style="width:200px; height:500px; border:2px solid #60F"> </div>
<script type="text/javascript">
$("#name").keyup(function(){
//取名称
var n = $(this).val();
if(n!="")
{
//调AJAX
$.ajax({
url:"listchuli.php",
data:{n:n},
type:"POST",
dataType:"TEXT",
success: function(data){
var sz = data.split("|");
var str = "";
for(var i=0;i<sz.length;i++)
{
str = str+"<div class='l'>"+sz[i]+"</div>";
}
$("#list").html(str);
}
});
}
else
{
$("#list").html("");
}
})
</script>
</body>
</html>
<?php
$name = $_POST["n"]; include("../DBDA.class.php");
$db = new DBDA(); $sql = "select areaname from chinastates where areaname like '%{$name}%' "; echo $db->StrQuery($sql);
ajax做用表格显示数据并增加操作列（删除）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script src="../../jquery-1.11.2.min.js"></script>
<title>无标题文档</title>
</head> <body>
<input type="button" value="显示" id="btn" /> <table width="100%" border="1" cellpadding="0" cellspacing="0">
<tr id="sj">
<td>代号</td>
<td>名称</td>
<td>操作</td> </tr> <tbody id="tb"></tbody> </table>
异步处理解决：1.变同步 2.放到执行返回值时的代码里面
<script type="text/javascript">
$("#btn").click(function(){
$.ajax({
url:"nationchuli.php",
dataType:"TEXT",
success: function(data){
var hang = data.split("|");
var str = "";
for(var i=0;i<hang.length;i++)
{
var lie = hang[i].split("^");
str = str+"<tr><td>"+lie[0]+"</td><td>"+lie[1]+"</td><td><span class='sc' bs='"+lie[0]+"'>删除</span></td></tr>";
}
$("#tb").html(str);
//加事件
$(".sc").click(function(){
alert("aa");
})
}
});
})
</script>
</body>
</html>
<?php
include("../DBDA.class.php");
$db = new DBDA(); $sql = "select * from nation"; echo $db->StrQuery($sql);