用AJAX从数据库返回数据

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>用AJAX从数据库返回数据 - runoops.com</title>
    <script>
        function showCustomer(str) {
            var xmlhttp;
            if (str == "") {
                document.getElementById("txtHint").innerHTML = "";
                return;
            }
            if (window.XMLHttpRequest) {
                // IE7+, Firefox, Chrome, Opera, Safari 浏览器执行代码
                xmlhttp = new XMLHttpRequest();
            }
            else {
                // IE6, IE5 浏览器执行代码
                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            xmlhttp.onreadystatechange = function () {
                if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
                    document.getElementById("txtHint").innerHTML = xmlhttp.responseText;
                }
            }
            xmlhttp.open("GET", "//demo.runoops.com/ajax/getcustomer.php?q=" + str, true);
            xmlhttp.send();
        }
    </script>
</head>

<body>

<form action="">
        <select name="customers" onchange="showCustomer(this.value)"
            style="font-family:Verdana, Arial, Helvetica, sans-serif;">
            <option value="">--选择--</option>
            <option value="Apple">Apple Computer, Inc.</option>
            <option value="Google">Google, Inc.</option>
        </select>
    </form>
    <br>
    <div id="txtHint">客户信息将显示在这...</div>

</body>

</html>