相关疑难解决方法(0)

我编写的代码看起来像:

function getStuffDone(param) {           | function getStuffDone(param) {
    var d = Q.defer(); /* or $q.defer */ |     return new Promise(function(resolve, reject) {
    // or = new $.Deferred() etc.        |     // using a promise constructor
    myPromiseFn(param+1)                 |         myPromiseFn(param+1)
    .then(function(val) { /* or .done */ |         .then(function(val) {
        d.resolve(val);                  |             resolve(val);
    }).catch(function(err) { /* .fail */ |         }).catch(function(err) {
        d.reject(err);                   |             reject(err);
    });                                  |         });
    return d.promise; /* or promise() */ |     });
}                                        | }

有人告诉我这个被称为" 延迟反模式 "或" Promise构造函数反模式 ",这个代码有什么不好,为什么这被称为 …

如何正确构造一个循环以确保后续的promise调用和链式logger.log(res)通过迭代同步运行？(蓝鸟)

db.getUser(email).then(function(res) { logger.log(res); }); // this is a promise

我尝试了以下方法(来自http://blog.victorquinn.com/javascript-promise-while-loop的方法)

var Promise = require('bluebird');

var promiseWhile = function(condition, action) {
    var resolver = Promise.defer();

    var loop = function() {
        if (!condition()) return resolver.resolve();
        return Promise.cast(action())
            .then(loop)
            .catch(resolver.reject);
    };

    process.nextTick(loop);

    return resolver.promise;
});

var count = 0;
promiseWhile(function() {
    return count < 10;
}, function() {
    return new Promise(function(resolve, reject) {
        db.getUser(email)
          .then(function(res) { 
              logger.log(res); 
              count++;
              resolve();
          });
    }); 
}).then(function() {
    console.log('all done');
}); …

我一直在学习使用蓝鸟两周的承诺.我对他们大多了解,但我去解决一些相关的问题,似乎我的知识已经崩溃了.我正在尝试这个简单的代码:

var someGlobal = true;

whilePromsie(function() { 
   return someGlobal;
}, function(result) { // possibly even use return value of 1st parm?
 // keep running this promise code
 return new Promise(....).then(....);
});

作为一个具体的例子:

// This is some very contrived functionality, but let's pretend this is 
// doing something external: ajax call, db call, filesystem call, etc.
// Simply return a number between  0-999 after a 0-999 millisecond
// fake delay.
function getNextItem() { 
    return new Promise.delay(Math.random()*1000).then(function() {
        Promise.cast(Math.floor(Math.random() * 1000));
    }); …