good promise rings

Promisewe need to know some extra knowledge before we talk about it. We know that the JavaScript implementation environment is "single-threaded", so-called single-threaded, is only able to perform one task at a time, if there are multiple tasks to queue, the previous task is completed before the next task can continue.This "single-threaded" advantage is simple to implement, easy to operate, the disadvantage is that it is prone to blocking, because if a task in the queue time is longer, then the

Deferred and PromiseES6 and JQuery have deffered and Promise, but they are slightly different. But their role can be easily described in two words. Deffered Trigger Resolve or Reject What to do after resolve or reject is declared in Promise (callback) In JQueryvar deferred = $.Deferred();var promise = deferred.promise();In the ES6var deferred =

Simple asynchronous programming promise mode and asynchronous promise Mode Asynchronous programmingJavascript asynchronous programming: popular programming methods in the web2.0 era. We usually use code more or less. The most typical is asynchronous ajax, which sends asynchronous requests and binds callback functions, after the request is responded, the specified callback function is called without blocking

Implement the promises library of nodejs Based on promise. js, promise. jsnodejs Today, I downloaded promise. js from the GIT source code library and found that the source code is written based on Web Front-end JavaScript and cannot be directly used for nodejs. Fortunately, there are not many codes and they are not very complicated. After analysis and integration

http://www.cnblogs.com/lvdabao/p/jquery-deferred.html @ Lv Tai LeopardThe first two we talked about the ES6 in the promise and promise/a+ norms, in the Promise knowledge system, jquery is certainly a necessary link, so this chapter is about the promise in jquery, which is what we know deferred object. In fact, there ar

Promise implements lazyman., promise implements lazyman First, please refer to the implementation of setTimeout by netizens: Function _ LazyMan (name) {this. tasks = []; var self = this; var fn = (function (n) {var name = n; return function () {console. log ("Hi! This is "+ name + "! "); Self. next () ;}}) (name); this. tasks. push (fn); setTimeout (function () {self. next () ;}, 0); // start the task in th

Let's say $. Deferred jquery with $. Deferred implements the promise specification, $. What the hell is deferred? Or the old way, print out to see, first have a visual impression: Javascript 12 var def = $. Deferred ();Console . Log (def) ; The output is as follows: $. Deferred () Return an object, we can call it the Deferred object, hanging some familiar methods such as: Done, fail, then, etc. jquery uses this defer

Javascript asynchronous programming code writing specification Promise learning notes, promise learning notes Recently, my work was easy. I remembered the word promise which I used to see before. So I learned it with patience. I. What is Promise? Why is there this? First of all, Pr