HTML 
＜script>
function createRequestObject() { 
var ro; 
var browser = navigator.appName; 
if(browser == "Microsoft Internet Explorer"){ 
ro = new ActiveXObject("Microsoft.XMLHTTP"); 
}else{ 
ro = new XMLHttpRequest(); 
} 
return ro; 
} 
var http = createRequestObject(); 
function sndReq(zip) { 
http.open(''get'', ''zipcode.php?zip=''+zip); 
http.onreadystatechange = handleResponse; 
http.send(null); 
} function handleResponse() { 
if(http.readyState == 4){ 
var response = http.responseText; 
var update = new Array(); 
if(response.indexOf(''|'' != -1)) { 
update = response.split(''|''); 
document.getElementById("city").value = update[0]; 
document.getElementById("state").value = update[1]; 
} 
} 
} 
＜/script>
＜h3>Enter A United States Zipcode, Then Tab＜/h3>
＜table align="center">
＜tr>
＜td>Enter Zipcode:＜/td>
＜td>＜input type="text" id="zipcode" name="zipcode" onBlur="sndReq(this.value);"/>＜/td>
＜/tr>
＜tr>
＜td>City:＜/td>
＜td>＜input type="text" id="city" name="city"/>＜/td>
＜/tr>
＜tr>
＜td>State:＜/td>
＜td>＜input type="text" id="state" name="state"/>＜/td>
＜/tr>
＜/table>
以上是客戶輸入頁面，下面是服務端的處理頁面''zipcode.php 

$dbuser = ''root'';
$dbpass = ''111111'';
$cn = mysql_connect("localhost", $dbuser, $dbpass);
$db = mysql_select_db("ajax");
$sql = "select city, state from zipcodes where zipcode = " . $_REQUEST[''zip''];
$rs = mysql_query($sql);
$row = mysql_fetch_array($rs);
echo $row[''city''] . "|" . $row[''state''];
mysql_close($cn);
?>
文章出處：http://www.diybl.com/course/4_webprogram/ajax/ajaxsl/200855/114002.html