php ajax 实例

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ajax.js

var xmlhttp;function AJAX(url){xmlhttp=null;if (window.XMLHttpRequest){// code for all new browsers  xmlhttp=new XMLHttpRequest();}else if (window.ActiveXObject){// code for IE5 and IE6  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");}if (xmlhttp!=null){  xmlhttp.onreadystatechange=state_Change;  xmlhttp.open("GET",url,true);  xmlhttp.send(null);}else{  alert("你的浏览器不支持XMLHTTP对象。");}}function state_Change(){if (xmlhttp.readyState==4){// 4 = "异步请求成功"if (xmlhttp.status==200){// 200 = OKvar o = document.getElementById("box");var str = xmlhttp.responseText;o.innerHTML = str;}else{alert("服务器出错，异步请求失败！");}}}

ajax.php

<?php$mysql_server_name = "localhost";$mysql_username = "root";$mysql_password = "";$mysql_database = "test";$conn = mysql_connect($mysql_server_name, $mysql_username, $mysql_password);// 从表中提取信息的sql语句$strsql = "SELECT * FROM  photo";// 执行sql查询@$result = mysql_db_query($mysql_database, $strsql, $conn);// 获取查询结果$row = mysql_fetch_row($result);$zhongjian = implode("", $row);/* var_dump($row).'<br/>';$zhongjian = implode("", $row);echo $zhongjian.'<br/>';foreach ($row as $key => $val) {    print $key . '=>'.$val.'<br/>';} */$id = $_GET["id"];switch($id){case "span":echo "这是点击span获取到的内容！";break;case "a":echo $zhongjian;break;default:"搞砸了！";} ?>

index,php

<!DOCTYPE HTML><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>异步请求</title><script type="text/javascript" src="ajax.js"></script><style type="text/css">#box {height: 32px;width: 150px;border: 1px solid #000;}</style></head><body><span onClick="AJAX('ajax.php?id=span')">我是SPAN标签</span>    <a href="javascript:void(0);" onClick="AJAX('ajax.php?id=a');">我是A链接</a><div id="box"></div></body></html>

http://www.palmdy.com

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