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这是一个与“Strophe.Connection.addHandler no works if call Strophe.Connection.sendIQ”相关的问题，但它对我没有帮助。我正在尝试运行“Wrox Professional XMPP Programming with JavaScript and jQuery Book”一书的程序，这是一个协作编辑器。

$(document).bind('connected', function () {
$('#disconnect').removeAttr('disabled');

NetPad.connection.addHandler(NetPad.on_message, null, "message");

if (NetPad.collaborator) {
    NetPad.master = false;

    $('#status')
        .text('Checking feature support for ' + NetPad.collaborator + '.')
        .attr('class', 'try-collab');

    // check for feature support
    NetPad.connection.sendIQ(
        $iq({to: NetPad.collaborator, type: 'get'})
            .c('query', {xmlns: Strophe.NS.DISCO_INFO}),
        function (iq) {
        console.log(iq);
            var f = $(iq).find(
                'feature[var="' + NetPad.NS_NETPAD + '"]');

            if (f.length > 0) {
                $('#status')
                    .text('Establishing session with ' + 
                          NetPad.collaborator + '.')
                    .attr('class', 'try-collab');

                NetPad.connection.send(
                    $pres({to: NetPad.collaborator})
                        .c('collaborate', {xmlns: NetPad.NS_NETPAD}));
            } else {
                $('#status')
                    .text('Collaboration not supported with ' +
                          NetPad.collaborator + '.')
                    .attr('class', 'no-collab');

                NetPad.connection.disconnect();
            }
        });
} else {
    NetPad.master = true;

    $('#pad').removeAttr('disabled');

    // handle incoming discovery and collaboration requests

    **NetPad.connection.addHandler(NetPad.on_disco_info,
                                 Strophe.NS.DISCO_INFO, "iq", "get");**

    NetPad.connection.addHandler(NetPad.on_collaborate,
                                 NetPad.NS_NETPAD, "presence");
    NetPad.connection.addHandler(NetPad.on_unavailable,
                                 null, "presence");
}
});



on_disco_info: function (iq) {
  console.log("==> On_disco_info()...");
    NetPad.connection.sendIQ(
        $iq({to: $(iq).attr('from'),
             id: $(iq).attr('id'),
             type: "result"})
            .c('query', {xmlns: Strophe.NS.DISCO_INFO})
            .c('identity', {category: 'client',
                            type: 'pc'}).up()
            .c('feature', {'var': NetPad.NS_NETPAD}));

    return true;
},

问题是 NetPad.on_disco_info(iq) 在与另一个合作者建立连接时不会被触发，尽管发送了一个 iq 节。我省略了 addHandler 的其余参数，以获取所有 iq 但又一无所获。我的服务器是 ejabberd。请问有什么不明白的地方。

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