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一个ajax实例
<!DOCTYPE html><html lang="zh-cn"><head><meta charset="utf-8"><meta name="renderer" content="webkit"><!--360,以webkit内核进行渲染--><meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1"><!--以最新内核进行渲染。--><meta http-equiv="Cache-Control" content="no-siteapp"/><!--百度禁止转码--><title>moyu demo</title><meta name="keywords" content="demo 测试 魔芋"><meta name="description" content="魔芋的测试示例"><meta name="author" content="魔芋,15000720652@163.com,http://www.cnblogs.com/moyuling/"><meta name="robots" content="index,follow"><!--定义网页搜索引擎索引方式--><meta name="viewport" content="width=device-width, initial-scale=1.0"><script src="http://libs.baidu.com/jquery/1.9.1/jquery.js"></script><style></style></head><body><script>function showUser(str){if(str ==""){ document.getElementById("txtHint").innerHTML ="";return;}if(window.XMLHttpRequest){// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp =newXMLHttpRequest();}else{// code for IE6, IE5 xmlhttp =newActiveXObject("Microsoft.XMLHTTP");} xmlhttp.onreadystatechange =function(){if(xmlhttp.readyState ==4&& xmlhttp.status ==200){ document.getElementById("txtHint").innerHTML = xmlhttp.responseText;}} xmlhttp.open("GET","http://localhost/moyu.php?q="+ str,true); xmlhttp.send();}</script></head><body><form><select name="users" onchange="showUser(this.value)"><option value="">Select a person:</option><option value="1">PeterGriffin</option><option value="2">LoisGriffin</option><option value="3">GlennQuagmire</option><option value="4">JosephSwanson</option></select></form><br><div id="txtHint"><b>Person info will be listed here.</b></div></body></html><?php$q=$_GET["q"];echo "$q";?>
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原文地址：http://www.cnblogs.com/moyuling/p/5272506.html
