async js tutorial

= Db.listcollections (). ToArray (); The Promise#then callback is a regular notation, but still executes asynchronously Tables.then (function (RS) { var ps = []; Rs.foreach (function (collection) { Ps.push (db.collection (collection.name). Count (). Then (function (count) { Collection.itemcount = count; }); }); Promise.all ensures that all collection.itemcount are queried, playing the role of synchronous Promi

Problem 1:ajax is asynchronous by default, so assigning values outside of the defined variables in AJAX does not assign values correctly1$ ("form"). Submit (function () {4 varFlag;5 $.ajax ({6Type: ' GET ',7URL: "@Url. Action (" Action "," Controller ")",9 //async:false,TenSuccessfunction(data) { One if(data = = "S")) { -Swal ("The Seed variety + seed batch already exists!") Do not repeat add!! ", data. MSG, "Warning"); -Flag =false; the } -

JS Code: //$ (document). Click (function (e) {//trigger this event by tapping anywhere on the page//var select = ""; //var i = $ (e.target). attr ("id"); //E.target indicates the target being clicked//here is a way to find the dropdown box in the actual project//select = E.target.parentnode.parentnode.getelementsbytagname (' select ')Loop the way to find the ID of the HTML tag in the dot//For (var i = 0; i //Selectid = select[i].id;

), and the second parameter is a callback function that will trigger the callback if there is an exception. In the example, insert only one data at a time, or you can insert more than one such as Q.push ([{name:0,time:1000}],{name:1,time:2000}]);(here are the arrays).Here, in order to verify that the loop is actually executing, two numbers are printed in the loop. The result of the execution is to cycle through the print Console.log (1) and then cycle through the Console.log (2), which shows tha

above, promise itself is an event publish/subscribe model.So the three functions above then are equivalent to the event binding function. (is the observer)When the previous task is deferred.resolve (data), corresponding to this task will trigger the Onfulfilled method.When the previous task is deferred.reject (err), the corresponding task will trigger the Onrejected method.Any one task, the onfulfilled or Onrejected method can only be triggered one, and is triggered once.The last catch in our m

*js is a real single-threaded language, in a small moment, in (JS of the execution of the column) only one execution, one is not finished, the other must wait, nothing to do, only shaking legs and so on;* Originally the language itself is synchronous, the reason is asynchronous execution, because in the browser environment, called the browser's API,One, Httpajax, is a single-threaded process that invokes th

can fill the code privately3. The problem occurs : (1) and the Blue menu is always loaded after the map is loaded.Because Ajax is asynchronous, even though the Add drop-down menu function is written before the map is loaded, he always shows up behind the map, even if adding a callback function is not used (I test it).(2) After the menu is loaded, the events added in the drop-down menu do not take effect.The events in the drop-down menu are written in the function that loads the map, but the add

Talking about async asynchronous programming in node. js, node. jsasync 1. What is asynchronous programming? Asynchronous programming refers to the failure to synchronously obtain execution results due to factors such as asynchronous I/O,The coding style of the next operation in the callback function, such as the setTimeout Function and ajax request. Example: for (var i = 1; i Most people think that the ou

Fs.readfile () is an asynchronous process, Countwordsintext (), and the Checkifcomplete () method is followed by the Tasks.push () method if(err) {ThrowErr} countwordsintext (text) Checkifcomplete ()})}) (Filesdir+ '/' +Files[index]) Tasks.push (Task)} for(varTaskinchtasks) {Tasks[task] ()}})As above two demos describes the underlying mechanism for serial and parallelization process control.SummarizeYou can manage asynchronous logic with callbacks, event emitters, and process controls.

Cocos2d-js tutorial cocos2d-js http network request, cocos2d-js tutorial This article by qinning199 original, reproduced Please note: http://www.cocos2dx.net/post/216 It is very simple to study the http network request of cocos2d-js