firefox扩展-xpi-显示网站ip地址

下载地址：https://files.cnblogs.com/joyrice/ipboy.xpi

最近学习了下firefox扩展的编写，这个算是实习作品，可以在浏览网站的时候，显示网站ip：

主要代码如下：

var IpBoy = {
  on: false,
  oldURL: null,
  
  init: function() {
    // Listen for webpage loads
    gBrowser.addProgressListener(this,
        Components.interfaces.nsIWebProgress.NOTIFY_STATE_DOCUMENT);
  },
  
  uninit: function() {
    gBrowser.removeProgressListener(this);
  },

  processNewURL: function(aURI) {
      if (aURI.spec == '' || aURI.spec == 'about:blank')
      {
          var lbl = document.getElementById("ipboy_statusbar_label");
        lbl.value = '^_^';
          return;
      }
      try
      {
        if (aURI.spec == this.oldURL)
          return;
        var x = new RegExp("http:\/\/([^:\/\?\&]*)", "ig");
        var execR = x.exec(aURI.spec); 
        var hostname = RegExp.$1;
        //alert(hostname);
        //return;  
        var dns = Components.classes["@mozilla.org/network/dns-service;1"].
        getService(Components.interfaces.nsIDNSService);
        var dnsResult = dns.resolve(hostname, 0);
        var ip = 'ip?';
        if (dnsResult.hasMore())
            ip = (dnsResult.getNextAddrAsString()); 
                  
        var lbl = document.getElementById("ipboy_statusbar_label");
        lbl.value = ip;
         
        this.oldURL = aURI.spec;
      }
      catch(ex)
      {
          //alert(aURI.spec);
          var lbl = document.getElementById("ipboy_statusbar_label");
        lbl.value = 'error';
      }
  },

  QueryInterface: function(aIID)
  {
   if (aIID.equals(Components.interfaces.nsIWebProgressListener) ||
       aIID.equals(Components.interfaces.nsISupportsWeakReference) ||
       aIID.equals(Components.interfaces.nsISupports))
     return this;
   throw Components.results.NS_NOINTERFACE;
  },

  onLocationChange: function(aProgress, aRequest, aURI)
  {
    this.processNewURL(aURI);
  },

  onStateChange: function() {},
  onProgressChange: function() {},
  onStatusChange: function() {},
  onSecurityChange: function() {},
  onLinkIconAvailable: function() {},
  
  onMenuItemCommand: function() {
    if (this.on)
    { 
        this.uninit(); 
        var lbl = document.getElementById("ipboy_statusbar_label");
        lbl.value = "ipboy off";
        this.on = false;
    }
    else
    {
        this.init(); 
        var lbl = document.getElementById("ipboy_statusbar_label");
        lbl.value = "ipboy on";
        this.on = true; 
    }  
    //var pnl = document.getElementById("hostboypanel");
    //pnl.hidden = !pnl.hidden;
    //window.open("chrome://hostboy/content/hostboy.xul", "", "chrome");
  }
};