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 = "您輸入的字串為："+ 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>
伺服器端代碼： 複製代碼 代碼如下:<?php
header('Content-type: text/html;charset=GB2312');
$ename = $_GET["page"];
if ($ename == "") {
$ename = "請輸入：";
}
echo ($ename);
exit(0);
?>
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