它是预期的行为，它在仍处于挂起状态时会返回承诺。
您应该使用它
then()来检查承诺解决方案。
另一件事是，在开始使用Promise时，您不应使用传统的mongo接口，而应承诺
Collection原型的所有方法，因此您可以返回mongo
find方法及其可扩展链创建的Promise。否则，我看不到使用诺言的意义。您的方式不会减少您必须编写的代码量。
顺便说一句，恕我直言，您应该使用bluebird而不是Q，因为它是目前唯一不会非常慢的promise库。
范例：
在db.js中
var mongoClient = require('mongodb').MongoClient;var collection = require('mongodb').Collection;var Promise = require('bluebird');// We promisify everything. Bluebird add ***Async function which return promises.Promise.promisifyAll(collection.prototype);Promise.promisifyAll(mongoClient);//In mongodb cursor is not built from protoype I use to promisify it each time. Not necessary if you don't use cursors.collection.prototype._find = collection.prototype.find;collection.prototype.find = function() { var cursor = this._find.apply(this, arguments); cursor.toArrayAsync = Promise.promisify(cursor.toArray, cursor); return cursor;};//then you connect to the DB and exports your collections...在其他地方，以您的示例为例：
this.loginUser = function(user) { var userid = user.userid, var password = (user.password) ? crypto.createHash("md5").update(user.password).digest("hex"): undefined var rememberme = user.rememberme; if(userid && password) { // we directly return the promise from mongodb, that we chain with a then return db.users.findoneAsync({ email: userid, password: password }) // return a promise that we chain .then(function(user) { // that we chain if(user) { var loginpre = uuid.v4(), var token = jwt.enpre({email: userid, password: password}, secret); if(rememberme) { res.cookie("cloginpre", loginpre, { magAge: 900000 } ); } return user; // return in a then callback will just resolve the promise } else { throw new Error('User not found'); // throwing in a then callback will just reject the promise } }); // end of the then, then return a promise that we return (with the return keyword above) } else { return Promise.reject("Username or Password was not entered"); // this is the only case where we have to actually create a promise ourself }}
