前言：这次介绍的是利用ajax与后台进行数据交换的小例子，所以demo必须通过服务器来打开。服务器环境非常好搭建，从网上下载wamp或xampp，一步步安装就ok，然后再把写好的页面放在服务器中指定的位置。打开时，在浏览器地址栏输入“localhost/指定页面”或者“127.0.0.1/指定页面”打开。
下面列出demo的HTML、PHP、原生ajax 、jq ajax代码。
HTML代码：
<!doctype html> <html> <head> <title>ajax示例</title> <meta charset='utf-8' /> <link rel="stylesheet" type="text/css" href="css/common.css" /> <style type="text/css"> .main{height:400px;width:800px;margin:100px auto 0;border:1px solid #000;} .list{height:400px;width:200px;float:left;background:#ddd;} .inf{height:400px;width:600px;float:right;background:#ccc;text-align:center;} .list li{width:200px;text-align:center;margin:50px 0 0;font-size:24px;cursor: pointer; } .inf img{width:360px;height:270px;margin:15px auto;} .inf p{width:580px;text-align:left;text-indent:2em;font-size:14px;margin:0 10px;} </style> </head> <body> <div class='main'> <div class='list' id='list'> <ul> <li name='spring' id='spring'>春</li> <li name='summer' id='summer'>夏</li> <li name='fall' id='fall'>秋</li> <li name='winter' id='winter'>冬</li> </ul> </div> <div class='inf' id='inf'> <!--要插入的内容--> </div> </div> </body> <script type="text/javascript" charset="utf-8" src="js/jQuery.js"></script> </html>
PHP代码：
<?php $details = array ( 'spring' => "<img src='images/spring.jpg' alt='' /><p>人间四月芳菲尽，山寺桃花始盛开</p>", 'summer' => "<img src='images/summer.jpg' alt='' /><p>水晶帘动微风起，满架蔷薇一院香</p>", 'fall' => "<img src='images/fall.jpg' alt='' /><p>金井梧桐秋叶黄，珠帘不卷夜来霜</p>", 'winter' => "<img src='images/winter.jpg' alt='' /><p>梅须逊雪三分白，雪却输梅一段香</p>" ); echo $details[$_REQUEST['LiName']]; ?>
原生ajax：
<script type="text/javascript">
var lis = document.getElementById('list').getElementsByTagName('li');
window.onload = initPage;
function initPage() {
for (var i=0; i<lis.length; i++) {
txt = lis[i];
txt.onclick = function () {
getDetails(this.id);
}
}
}
function creatRequest() {
try {
request = new XMLHttpRequest();
}
catch (tryMS) {
try {
request = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (otherMS) {
try {
request = new ActiveXObject("Miscrosoft.XMLHTTP");
}
catch (failed) {
request = null;
}
}
}
return request;
}
function getDetails(itemName) {
request = creatRequest();
if (request == null) {
alert('没有成功创建请求')
return;
}
var url = "getDetails.php?LiName="+escape(itemName);
request.open("GET",url,true);
request.onreadystatechange = displayDetails;
request.send(null);
}
function displayDetails() {
if (request.readyState == 4) {
if (request.status == 200) {
detailDiv = document.getElementById("inf");
detailDiv.innerHTML = request.responseText;
}
}
}
</script>
JQ ajax:
<script type="text/javascript">
$('#list li').click ( function () {
$.ajax({
type:'GET',
data:'',
url:"getDetails.php?LiName="+this.id,
success:function(data){
$('#inf').html(data);
},
dataType:'text',
error:function (){
alert("失败！");
}
})
});
</script>