为啥点一下完全没有反应呢？
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8" />
<title>ajax test case</title>
<script language="javascript">
var xmlHttp = null;
function GetXmlHttpRequest()
{
var xmlHttp=null;
try
{
xmlHttp = new XMLHttpRequest();
}
catch(e)
{
try
{
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e)
{
xmlHttp = false;
}
}
}
return xmlHttp;
}
function sendRequest()
{
var prov_name = document.getElementById("province").value;
if((prov_name == null) || (prov_name == ""))
{
alert("请选择！");
return;
}
xmlHttp = GetXmlHttpRequest();
if(xmlHttp == null)
{
alert("浏览器不支持XmlHttpRequest！");
return;
}
var url = "test.php";
url = url + "?prov=" + prov_name;
xmlHttp.open("GET", url, true);
xmlHttp.onreadystatechange = updatePage;
xmlHttp.send(null);
}
function updatePage()
{
if(xmlHttp.status == 200)
{
var response = xmlHttp.responseText;
document.getElementById("city").innerHTML = response;
}
}
</script>
</head>
<body>
<h3>请选择一个省（自治区）：</h3>
<form action="test.php">
<div>
<select id="province" onChange="sendRequest()">
<option value="ah">安徽</option>
<option value="fj">福建</option>
<option value="gs">甘肃</option>
<option value="gd">广东</option>
<option value="gx">广西</option>
<option value="gz">贵州</option>
<option value="hn">海南</option>
<option value="hb">河北</option>
<option value="hh">河南</option>
<option value="hl">黑龙江</option>
</select>
</div>
</form>
<div id="city">
</div>
</body>
</html>
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FROM 220.231.12.*