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我通过下面的代码使用 AJAX:

Javascript:

function CallAJAX() {
    var url = "MyAJAX.ashx";
    xmlRequest.open("POST", url);
    xmlRequest.onreadystatechange = function () { ApplyUpdateCallAJAX() }
    xmlRequest.send(null);
}

function ApplyUpdateCallAJAX() {
    if (xmlRequest.readyState == 4) {
        if (xmlRequest.status == 200) {
            var response = xmlRequest.responseText;
            document.getElementById("resultDIV").innerHTML = response;
        }
    }
}

.ashx 文件(在 asp.net 中):

...
...
HttpResponse response = context.Response;
response.ContentType = "text/html";
...

response.Write("Connecting...");
// connecting to database - for example takes 10 seconds !

...
response.Write("Reading...");
// reading data from database - for example takes 5 seconds !

...

这样用户将等待 AJAX 15 秒,然后看到如下结果:

Connecting...Reading...

反正有没有独立显示这两个响应!?

例如,我们得到如下结果的某种方式:

用户首先看到文本正在连接...,然后在 10 秒后(连接的时间很长!)文本更改并且用户看到文本正在阅读...

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