html>
head>
meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
title>一个简单的不涉及服务器的Ajax实例/title>
script type="text/javascript">
// 声明一个引用 XMLHttpRequest 的变量
var xhr = null;
// 选择一个著作时调用的函数
function updateCharacters() {
var selectShow = document.getElementById("selShow").value;
if (selectShow == "") {
document.getElementById("divCharacters").innerHTML = "";
return ;
}
// 实例化一个 XMLHttpRequest 对象
if (window.XMLHttpRequest) {
// 非IE
xhr = new XMLHttpRequest();
} else {
// IE
xhr = new ActiveXObject("Microsoft.XMLHTTP");
}
xhr.onreadystatechange = callbackHandler;
url = selectShow + ".html";
xhr.open("post", url, true);
xhr.send(null);
}
// this is the function that will repeatedly be called by our
// XMLHttpRequest object during the life cycle of request
function callbackHandler() {
if (xhr.readyState == 4) {
document.getElementById("divCharacters").innerHTML = xhr.responseText;
}
}
/script>
/head>
body>
我们的第一个Ajax实例
br>/br>
选择一个名著：
br>
select onchange="updateCharacters();" id="selShow">
option value="">/option>
option value="xyj">西游记/option>
option value="hlm">红楼梦/option>
option value="shz">水浒传/option>
option value="sgyy">三国演义/option>
/select>
br>/br>
返回，名著中主要任务：
br>
div id="divCharacters">
select>
/select>
/div>
/body>
/html>

select>
option>唐僧/option>
option>孙悟空/option>
option>猪八戒/option>
option>唐僧/option>
option>观音姐姐/option>
option>西天如来/option>
/select>

select>
option>贾宝玉/option>
option>林黛玉/option>
option>薛宝钗/option>
/select>

select>
option>林冲/option>
option>李逵/option>
option>宋江/option>
option>时迁/option>
/select>

select>
option>刘备/option>
option>关羽/option>
option>张飞/option>
option>曹操/option>
option>小乔/option>
option>诸葛亮/option>
/select>