源代码：
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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <script> function showCustomer(str) { var xmlhttp; if (str == "") { document.getElementById("txtHint").innerHTML = ""; return } if (window.XMLHttpRequest) { xmlhttp = new XMLHttpRequest() } else { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP") } xmlhttp.onreadystatechange = function() { if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { document.getElementById("txtHint").innerHTML = xmlhttp.responseText } } xmlhttp.open("GET", "/try/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="APPLE">Apple Computer, Inc.</option> <option value="BAIDU ">BAIDU, Inc</option> <option value="Canon">Canon USA, Inc.</option> <option value="Google">Google, Inc.</option> <option value="Nokia">Nokia Corporation</option> <option value="SONY">Sony Corporation of America</option> </select> </form> <br> <div id="txtHint">客户信息将显示在这...</div> </body> </html>
运行结果：
