在 Chrome 中加载 (readyState==3) 时的 XmlHttpRequest.responseText

I am trying to "streaming" (from server to client) in Javascript by ajax (by XmlHttpRequest (=xhr). I am using modified handleResponse function described in Cross-browser implementation of "HTTP Streaming" (push) AJAX pattern

function handleResponse() {
if (http.readyState != 4 && http.readyState != 3)
    return;
if (http.readyState == 3 && http.status != 200)
    return;
if (http.readyState == 4 && http.status != 200) {
    clearInterval(pollTimer);
    inProgress = false;
}
// In konqueror http.responseText is sometimes null here...
if (http.responseText === null)
    return;

while (prevDataLength != http.responseText.length) {
    if (http.readyState == 4  && prevDataLength == http.responseText.length)
        break;
    prevDataLength = http.responseText.length;
    var response = http.responseText.substring(nextLine);
    var lines = response.split('
');
    nextLine = nextLine + response.lastIndexOf('
') + 1;
    if (response[response.length-1] != '
')
        lines.pop();

    for (var i = 0; i < lines.length; i++) {
        // ...
    }
}

if (http.readyState == 4 && prevDataLength == http.responseText.length)
    clearInterval(pollTimer);

inProgress = false;
}

使用 php 脚本，它会刷新我的数据(没有 ajax，它确实会在进行时将数据刷新到浏览器)