js promise

varCO = require ("CO");varFS = require ("FS");functionCusreadfile (fileName) {//In summary, to return a Promise object, it is also possible to write, because Fs.readfile returns a Promise object /** * return function (FN) {* Fs.readfile (FILENAME,FN); * } */ return NewPromise (function(Resolve, Reject) {SetTimeout (function() {Resolve ("File content: ABC"); }, 2000); });}function*ReadFile () {varA

Http://mongoosejs.com/docs/api.html#promise_Promise Promise#then (Onfulfill, Onreject) Creates a new promise and returns it. If Onfulfill or Onreject are passed, they are as added success/error to this callbacks after the promise.Parameters: onfulfill Returns: : promises-a+ Mpromise#then Conforms to promises/a+ specification. Example: var promise = Meetups.fin

Kunlun, the hero of the promise, learned to walk upright from a slave who crawls only on the ground because he was chased by a cow (thoroughly revolutionizing the evolutionary theory of standing walking because of his work ), then I learned to run at an invisible speed, so that I became a general after getting "Flower Armor". Therefore, the title may be "from slaves to generals". Reference: Some people have also named it from other aspects, such as b

I signed up for the children 4 months ago to attend the IT training course, and really fulfilled the original promise (guaranteed employment). The normal thing is that it's news.I was at the end of January for my daughter in Nanshan, a unit enrolled in learning UI training, only signed a paper employment security agreement. At that time, the course enrolled in the class promised to class every day, I took my daughter to study. Week 6th is to see the w

Let p = new Promise (function (resolve, reject) //asynchronous operationSetTimeout (function () {A successful callback, reject for a failed callback; resolve (data); },2000);})Then the first parameter executes the resolve, the second parameter executes the Reject;P.then (res=>{Console.log (RES)}). catch (err=>{The catch executes a second parameter similar to then, and reject if the resolve callback exception is executed;Console.log (ERR)}

app.factory (' MainClass ', function ($http, MAINFAC) {var mainclass= function () {this.uid; This.sid; This.getuid (); } mainclass.prototype.getuid=function () {var promise = Mainfac.query (' OPT ', ' PARM1 ', ' PARM2 '); Promise.then (function (data) {Console.info ("MainClass is:", data); This.sid=data.sid; Console.info ("This.sid:", This.sid); }); }; re

Abstract: 45 Insurance companies yesterday promised ——— last morning, 45 insurance companies in the country signed two social commitment to insurance services, including "Motor vehicle insurance Service Commitment" and "personal accidental injury45 Insurers yesterday promised ———Yesterday morning, 45 insurance companies across the country signed two social commitments on insurance services in Beijing, including the pledge on motor vehicle insurance Services and the

Main.jsConst CP = require (' child_process '); Const CHILD = Cp.fork ('./child.js '); const Callbackpool = {};child.on (' message ', msg = > {Let msgId = msg._id, cb = Callbackpool[msgid]; if (CB) {cb.resolve (msg); Cleartimeout (Cb.timer); Callbackpool[msgid] = null; }}); Promise.all ([SendMessage ({timeout:1e3}), SendMessage ({timeout:2e3}), SendMessage ({timeout:2e3}), Sendmessa GE ({TIMEOUT:1E3}),]). Then (rv + {log (RV);}). catch (Err = {log (err);}) function SendMess

/* Excerpt from a front-end public number If there is a similarity, purely coincidental */function init (arguments) { return new Promise (checkforargument);} function Checkforargument (resolve, Reject) { try{ if (arguments) { return resolve (TRUE); } Return resolve (FALSE); } catch (e) { reject (e); }} function Evaluateres (res) { if (res) { dosomethingelse (); } else{ dosomething

after just a few lines of code without using any dirty timers. Not only that, you can even return the Unitywebrequest.send () function and pause your function until you get an HTTP response. You might ask, "What's the problem?" First, you cannot easily return a value from a synergistic program. The function signature needs to return IEnumerator to keep track of when and how to recover your method. Second, there is no exception handling at the level of the collaboration program. You can't be in

Your promise, I have no faith, you may play, I have learned to abandon.Is the reality too fake, keep yourself too silly!Love, either to be proficient, or to make people wrong!Suppose someday, I put on the wedding clothes for others, can because of the age, because of the exhaustion!I want a real pain, do not reluctantly speak. Because the pain can be slowly to annihilate, but your hypocritical language I can not help but again convinced, again trapped

looked angrily at the theory of the past, not to three words, a tussle. As a result, he hung the color, his head wrapped in a piece of gauze for several months. The spike man asked him about the situation and he was honest. Finally, a sentence: I can be bullied, my mother can not.I transferred my work and seldom went to catch the big episode. Back to the old place, it is a winter, the collection is still bustling, but the spikes stand there, empty, has not him. I crouched there for a while, dis

the asynchronous tasks, and then start the second group after the evaluation succeeds ... Finally, when the complete group is traversed, the result is returned.Can be simply described as: resolve ([+]). then ([4,5,6]). Then ([7,8,9])The idea seems simple and intuitive, but how to create a dynamic then chain really cost me a lot of brains, after writing the code has a deeper understanding of promise.After writing the code I cheerfully to show colleagues, colleagues said I was too complicated to

Smiling and watching his son eat a lollipop, he handed it to me and said, "Mom, try it ~" I said, "You cannot give this lollipop for a while, but you can only give it for a while. You can buy it for others, but you cannot ." He made the first promise to me: "When I grow up, I will buy a lollipop for my mother, one for my father, and two for me ~" One side is trying to stretch two fingers. This kind of feeling is warm and has the power of people. T

country, the world, and future generations, they can make their days more efficient and bring happiness and happiness to them."Kai-Fu Lee said Microsoft: A reporter asked me some time ago when to leave Microsoft? My answer is, I'm sure Microsoft is the last business company in my service, because my goal is to be a very influential person, no other company can help me achieve this. (March November 2004)----------------------------------------------------------Seeing an interview with K

Before doing a crud method on a page, in reality the Webapi module is often written in separate service, so modify the original design and structure, or need a lot of knowledge.2017.11.15 Add patch method to improve service program optimization notation2017.11.27 added promise return value processing, the server returns the error message after processing.Because all of the crud methods are written in the service, the code in the background is much sim

Invoke function ajax ({URL: ' Your request URL ', method: ' Get ', async:true, timeout:1000, Data: {test:1, Aaa:2}}). Then (res => console.log (' Successful request: ' + res '), Err => Console.log (' request failed: ' + err ')//focus ... Functions encapsulate function Ajax (options) {Let URL = Options.url Const method = Options.method.toLocaleLowerCase () | | ' Get ' const ASYNC = Options.async!= false//default is true const data = Options.data Const XHR = new XMLHttpRequest () if (opt

end in one, the code is written together, I request an address, the server is in the form of the corresponding body returned to me a page. The advent of Ajax has changed this, and we can take this to get the specific data we need to update the data without overloading the entire page.var xmlhttp;if (window. XMLHttpRequest) { xmlhttp = new XMLHttpRequest ();//ie7+, Firefox, Chrome, Opera, Safari Browser execute code}else { xmlhttp = New ActiveXObject ("Microsoft.XMLHTTP");//IE6, IE5 browse

Recent project iterations, from Express to KOA, face callback, want to lazy, think of the proxy object NewProxy (docker,{get:function(obj,name) {return function(ARG) {Let length=Arguments.lengthif(length) { returnObj[name]} arg= Array.prototype.slice (0) return NewPromise (function(resolve,reject) {arg[length-1] =function(err,data) {if(ERR)returnreject (Err) resolve (data)}) } } })There is such a basic idea, due to more limitations, and the specific implementation

Php promise classification (recursion) implementation code. For more information, see. The code is as follows: $ Conn = mysql_connect ("localhost", "root", "myoa888 ");Mysql_select_db ("lost63", $ conn) or die ("select db error ");$ SQL [] = "Create TABLE 'lost63'. 'DD _ book_class '('Id' int not null AUTO_INCREMENT primary key,'Classname' VARCHAR (50) not null,'Classid' INT NOT NULL)";$ SQL [] = "insert 'DD _ book_class '(classname, classid) valu