通過xmlHttp和ASP的結合，我們可以輕鬆完成網頁的非同步呼叫。
代碼如下：
1.建立Display.asp(這是前台顯示頁面)
注意xmlhttp.readyState的4個屬性
1:LOADING;2:LOADED;3:INTERACTIVE;4:COMPLETED
<%@ Language=VBScript %>
<HTML>
<HEAD>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
</HEAD>
<script language="javascript">
xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
function fnDo(ID)
{
var xmlDom = new ActiveXObject("Msxml2.DOMDocument");
var strURL = "GetInfo.asp?ID=" + ID;
xmlhttp.Open("POST",strURL , true);
xmlhttp.onreadystatechange = fnRun;
xmlhttp.Send(xmlDom);
divTest.innerHTML = "Loading..."
}
//--------------------------------------------------------
function fnRun()
{
var state = xmlhttp.readyState;
var xmlDom = new ActiveXObject("Msxml2.DOMDocument");
if (state == 4)
{
xmlDom.loadXML(xmlhttp.responseXML.xml);
//alert(xmlDom.documentElement.selectSingleNode("//objXML").text)
var getInfo = xmlDom.documentElement.selectSingleNode("//objXML").text;
divTest.innerHTML = getInfo
}
}
</script>
<BODY>
<input type=text id=txtInput>
<input type=button value="非同步呼叫" onclick="fnDo(document.all.txtInput.value)">
<DIV id=divTest></DIV>
<P> </P>
</BODY>
</HTML>
2.在建立GetInfo.asp(這是幕後處理頁面)
<%
Dim sID,objResult
sID = Trim(Request("ID"))
'sID = 28
Set objResult = Server.CreateObject("MSXML2.DOMDocument")
objResult.loadXML ("<objXML></objXML>")
'**************************************************************
'**************************************************************
objResult.selectSingleNode("objXML").text = "Get:" & sID
Response.ContentType = "text/xml"
objResult.save (Response)
Response.End
Set objSch = Nothing
Set objResult = Nothing
%>
3.運行Display.asp頁面，在文字框裡輸入內容，點擊按鈕，可以看到Loading的提示，隨後在不重新整理頁面的情況下得到了文字框裡的內容。當然你也可以在GetInfo.asp那個頁面雷根據發送的參數做一些複雜的出來，隨後把結果返回出來
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
