<!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=gb2312" /> <title>无标题文档</title> </head> <script language="javascript"> var xmlHttp; function createXMLHttpRequest(){ if(window.ActiveXObject){ xmlHttp = new ActiveXObject("microsoft.XMLHTTP"); } else if(window.XMLHttpRequest){ xmlHttp = new XMLHttpRequest(); } } function sendRequest(){ createXMLHttpRequest(); var name = document.getElementById("name").value; url = "String_check.php?page="+name; xmlHttp.onreadystatechange = callback; xmlHttp.open('GET',url,true); xmlHttp.send(null); } function callback(){ if(xmlHttp.readyState == 4){ if(xmlHttp.status == 200){ document.getElementById("show").innerHTML = "您输入的字符串为："+ xmlHttp.responseText; } } } </script> <body> <p>AJAX test;</p> <p><br/> <input type="text" id="name" onkeyup="sendRequest();" /> <br/> <span id="show"></span> </p> </body> </html> 服务器端代码： 复制代码 代码如下: <?php header('Content-type: text/html;charset=GB2312'); $ename = $_GET["page"]; if ($ename == "") { $ename = "请输入："; } echo ($ename); exit(0); ?>