Ajax(一)显示可用内存空间

打开VS，新建空网站，添加新项命名为Receive.aspx<br>
在后台的内容为：
protected void Page_Load(object sender, EventArgs e)
{
PerformanceCounter myMeroy = new PerformanceCounter();
myMeroy.CategoryName = "Memory";
myMeroy.CounterName = "Available KBytes";
string txtRelust = "-->可用的内存：" + myMeroy.NextValue().ToString() + "KB";
Response.Write(DateTime.Now.ToLongTimeString()+" "+ txtRelust);
}
添加一个htm文件，命名为client.htm
<script type="text/javascript">
var XmlHttp = new ActiveXObject("Microsoft.XMLhttp");

function sendAJAX() {
XmlHttp.Open("POST", "Receive.aspx", true);
XmlHttp.send(null);
XmlHttp.onreadystatechange = ServerProcess;

}

function ServerProcess() {
if (XmlHttp.readystate == 4 || XmlHttp.readystate == 'complete') {
document.getElementById('div1').innerHTML = XmlHttp.responsetext;
}
这样就会出现一个不断变化的内存空间