使用addProgressListener和onStatusChange获取页面的DNS查找时间
我正在尝试向 Firefox 扩展添加功能，以计算网页执行 DNS 查找所需的时间。看看 Firebug，我认为可以通过向浏览器对象添加 Web 进度侦听器并侦听事件来实现此目的。
首先，我在加载页面时注册一个事件侦听器：
window.addEventListener("load", function(e) { myObj.onLoad(e); }, false);
在 myObj.onLoad() 内部，我这样注册我的 Web 进度侦听器：
gBrowser.addProgressListener(this, Components.interfaces.nsIWebProgress.NOTIFY_ALL);
最后，我在 myObj 内部实现“onStatusChange”，以及 QueryInterface 和其他内容：
onStatusChange: function(aWebProgress, aRequest, aStatus, aMessage) {
this.logInfo("onStatusChange: " + aMessage + ". Time = " + (new Date().getTime()));
}
但是，当调用 onStatusChange 时，aStatus即使 aMessage 显示正确的事件，也始终为 0。我花了几个小时试图弄清楚这一点。有什么想法为什么吗？
此外，状态为“Ci.nsISocketTransport.STATUS_RESOLVING”的 onStatusChange 似乎仅在某些组件上被调用，而不会被其他组件调用，即使它们可能具有需要转换的不同域名并且 DNS 尚未缓存。需要帮助请！
I'm trying to add functionality to a firefox extension to time how long it takes a webpage to perform DNS lookup. Looking at Firebug, I figured it's possible to do so by adding a web progress listener to the browser object and listening for events.
First I register an event listener when a page is loaded:
window.addEventListener("load", function(e) { myObj.onLoad(e); }, false);
Inside myObj.onLoad() I register my web progress listener as such:
gBrowser.addProgressListener(this, Components.interfaces.nsIWebProgress.NOTIFY_ALL);
Finally I implement 'onStatusChange' inside myObj, along with QueryInterface and others:
onStatusChange: function(aWebProgress, aRequest, aStatus, aMessage) {
this.logInfo("onStatusChange: " + aMessage + ". Time = " + (new Date().getTime()));
}
However, when onStatusChange is called, aStatus is always 0 even though aMessage displays the correct event. I've spent hours trying to figure this out. Any ideas why??
Also it seems that onStatusChange with status of 'Ci.nsISocketTransport.STATUS_RESOLVING' is only being called on some components, without being called for others, even though they may have a different domain name that needs to be translated and the DNS has not been cached. Need help plz!
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如果将进度侦听器附加到选项卡式浏览器，您只能获得进度事件的筛选视图。您可能会发现需要将进度侦听器附加到内部浏览器。 （如果您想观看多个选项卡/窗口，您可能会发现最好将进度侦听器附加到窗口本身，或者对于服务，附加到根文档加载器。）
If you attach a progress listener to the tabbed browser you only get a filtered view of progress events. You might find that you need to attach your progress listener to the inner browser instead. (If you want to watch multiple tabs/windows you might find it better to attach your progress listener to the window itself, or, for a service, to the root document loader.)