synchronous

问题 I'm rather new at swift and have been doing some research on how to answer this question myself since I want to learn, but I am completely stumped. I have a function which requests data from a server, and after the data is received, a completion handler is executed which parses the data. Within the previously mentioned completion handler, another function is called which is passed a completion handler itself. For some reason, the function call within the function is being being skipped, and

问题 I involved my self within a bet, our feud is about - Async WebServices and the other stuff i mentioned above. I am thinking logically web service by default is sync, the other said that it is not correct. Who is right or wrong can any one explain it to me? Thanks in advance. 回答1: All of them are by default synchronous but you can write all of them asynchronously and you can call all of them asynchronously. You should always differ between synchronous/asynchronous call and between synchronous

问题 I'm writing an application in javascript where I make a CORS request to the server to grab a data array. Then, for each item in the array, I need to make another CORS call to get additional info on that element. I originally thought I could return values from my CORS request like: data = getData(param); But apparently you can't mix synchronous and asynchronous code. What's the best way to accomplish this? 回答1: Promises. Here's how you might use them using your requirements, and a setTimeout

问题 I'm parsing data returned from Eventbrite's API, and forming objects from the name of the event and any img tags scraped from the entirety of data response. for (var i = 1, l = rawEventbriteData.length; i < l; i++){ var eventObject = { name: rawEventbriteData[i].event.title, images: [] }; var jsdom = require('jsdom'); var arrayOfImgs = []; jsdom.env({ html: rawEventbriteData[i].event.description, scripts: ["http://code.jquery.com/jquery.js"], done: function(errors, window) { window.$('img')

问题 This is an extension to my previous question, which received a very explanatory answer. It turns out that I did not provide enough context to my app to make the question useful enough for my actual situation. Here is a route within my Express app: var eventbriteService = require('../apiRequests/eventbriteService'); var queue = require('queue-async'); app.get('/events', function (req, res, next) { queue() .defer(eventbriteService.getEventbriteEvents) .await(function(err, data) { if (err)

问题 I'm using Martin Wendt's Dynatree and want to update the tree in Ajax, dynamically and recursively. For this, I'm using functions like tree.getNodeByKey(nodes[i-1]).appendAjax({}); and tree.activateKey(nodes[i]); in a for loop. When adding alert("Hello world"); into the loop, my code works correctly 95% or the time. Without it, the code never works. The problem is obviously coming from the fact that Dynatree is performing its Ajax requests in asynchronous mode , and seem ignoring the async

问题 I'm having an issue when trying to query based on the result of another query on mongodb. I'm trying to make an initial query and then do another query for each one of the result of the first query. The reason I'm doing it like this is because I have two different collections and I need to join some data from one collection with the data of the other collection. In a SQL world I could easily do this with a JOIN, but as I'm using mongodb in this one I can't really use JOINs, so I guessed doing

问题 I have a toolkit that I need to work with (to interface with a remote service). This toolkit queries the remote service and asks for results. It does this asynchronously, which in most cases is good , but not for creating concise methods. I want to make methods similar to the following: -(NSArray *)getAllAccounts { NSString *query = @"SELECT name FROM Account"; //Sets "result" to the query response if no errors. //queryResult:error:context: is called when the data is received [myToolkit query

问题 I am coming from php background where sql queries are blocking. My usual setup is to make a try, catch block to handle any possible errors that might happen during table updating. I wanted to transfer this logic to nodejs, but it's asynchronous nature is making this troublesome. Take a look at example code: var httpServer = Https.createServer(httpsOptions, function (request, response) { try { //many queries in if-else, switch statements if(something){ mysqlConnection.query(query,[],function

问题 A function uses the jquery.ajax() method to get data from server and use it as return value. If I use async=true the function returns prematurely empty value. If I use async=false the wait for the function is too long. I tried toggle div showing spinning clock right before the request, but the div does not appear until the request is over. Any advice on how not to lock the browser or show wait icon/symbol/text? 回答1: You can't. Synchronous requests will lock up the browser, including any