XMLHttpRequest读取渐进式数据不起作用？ [英] XMLHttpRequest read progressive data not working?

问题描述

我遇到XMLHttpRequest下载渐进式数据的问题。我获得状态2而不是状态3.状态3之后它再也不会被调用。我究竟做错了什么？我读到了需要刷新数据的地方但是我该怎么做？

I'm having issues with XMLHttpRequest downloading progressive data. I get a state 2 and than state 3. After state 3 it never gets called again. What am I doing wrong? I read somewhere I need to flush the data but how do I do that?

这是我的代码：

var xmlHttp = new XMLHttpRequest();
// try to connect to the server
try
{
  // initiate server request
  xmlHttp.open("GET", "http://208.43.121.133:8164/;", true);
  xmlHttp.setRequestHeader("Icy-Metadata", "1");
  xmlHttp.onreadystatechange = function() 
  {
    alert("status: "+xmlHttp.status);
    alert("State: "+xmlHttp.readyState);

    if (xmlHttp.readyState == 3)
    {
      alert(xmlHttp.responseText);
    }
  };
  xmlHttp.send(null);
}
// display an error in case of failure
catch (e)
{
  alert("Can't connect to server:\n" + e.toString());
}

am readyState为3时我是否可以读取xmlHttp.responseText？

am I allowed to read the xmlHttp.responseText when readyState is 3?

推荐答案

Kranu是正确的，当readyState为3时，不允许读取responseText。请参阅 http://www.davidflanagan.com/2005/08/xmlhttprequestreadystate-3.html

Kranu is correct, you're not allowed to read responseText when readyState is 3. See http://www.davidflanagan.com/2005/08/xmlhttprequestreadystate-3.html

解决方案是一次发送一条消息。当您收到一条消息时，只需再制作一个XHR。这就是谷歌做（服务员？）服务器推送的方式。

The solution is to send a message at a time. When you receive one message, just make another XHR. That's how google does (did?) server push.

这篇关于XMLHttpRequest读取渐进式数据不起作用？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！