node-imap 依次执行函数队列

gistfile1.js

var box, cmds, next = 0,
  cb = function(err) {
    if (err) die(err);
    else if (next < cmds.length) cmds[next++].apply(this, Array.prototype.slice.call(arguments).slice(1));
  };
cmds = [

function() {
  imap.connect(cb);
}, function() {
  imap.openBox('INBOX', false, cb);
}, function(result) {
  box = result;
  imap.search(['SEEN', ['SINCE', 'August 15, 2012']], cb);
}, function(results) {
  var fetch = imap.fetch(results, {
    request: {
      headers: ['from', 'to', 'subject', 'date']
    }
  });
  fetch.on('message', function(msg) {
    console.log('Got message: ' + util.inspect(msg, true, 5));
    msg.on('data', function(chunk) {
      console.log('Got message chunk of size ' + chunk.length);
    });
    msg.on('end', function() {
      console.log('Finished message: ' + util.inspect(msg, false, 5));
    });
  });
  fetch.on('end', function() {
    console.log('Done fetching all messages!');
    imap.logout(cb);
  });
}

];