parameters of the all method * This time the Promise.all method maintains a state, which is determined by the state of the multiple asynchronous tasks that are passed in * when the state of multiple asynchronous tasks becomes resolved, then all state is resolved, But as soon as the state of an asynchronous task becomes rejected, the state of all becomes rejected * */ p1 P2 is two promise in the following method only if p1 p2 is resolved, the following function method Promise.all ([p1, p2]) is e
: Asynchronous operation timed out
//Querying the status of the futureStd::future_status status;do {status = Future.wait_for (Std::chrono::seconds (1)); if (status = std::future_status::d eferred) {cout "deferred\n";} else if (status = = std::future_status::timeout) {std::cout timeout\n ";} else if (status = = std::future_status::ready) {std::cout ready!\n";}} while (status! = std::future_status::ready); There are three ways to get a future result: get, wait, wait_for, where get waits
recommended, in our business, basically prohibit the use of settimeout in the business logic, because I see a lot of ways to use the problem is difficult to solve, settimeout as a hack way.
For example, we use this instance before an instance is initialized, and the wrong solution is to use an instance with a settimeout to ensure that the instance is initialized first.
Why the mistake? This is actually the way to use hack.
The first is to bury the pit, disrupting the life cycle of the module
) //[]
})
3.async await
Promise solves our many problems with async, but it still shows redundancy and needs. Then () in the meantime, the anonymous function is used to receive the result, so there is an async function on the promise basis, which is the es2017 standard
(1) Async is used to declare that a function is an asynchronous function, and it always returns promises, regardless of the value inside the function return
Const ASYNCFUN1 = Async () = {
return ' str '
}
const ASYNCFUN
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use async/await
// Assume that getData () and getOther () return a Promis actions: {async actionA ({commit}) {commit ('gotdata', await getData ())}, async actionB ({dispatch, commit}) {await dispatch ('actiona ') // wait for actionA to complete commit ('gootherdata', await getOtherData ())}}
Modules
When a single State Tree is used, the store object will become bloated when the application becomes very large.
Vuex allows us to split the store into mo
PromisePromise.reject = function (reason) {var child = new Promise (NOOP);Reject (child, reason);return to child;};Promise.all (iterator)Here we have been able to achieve the basic Promise, Promise.all and Promise.race will not continue to describe, interested can continue to read the specification, here is a diagram to illustrate my understanding of these two functions:
Promise.all understand
Calling Promise.all creates a new object that stores the processing state of all promise, saves the
, just pass a parameter of age can be, the following two parameters may be converted to Promis as the return value processing, see how the JS side is called://As the test button' #5f9ea0 'activeopacity={0.8} onpress={() = This. _promise ( -)} > //Button callback event that will call the iOS method hereAsync_promise (age) {//promise callback, asynchronous execution Try{varIosexport = Nativemodules.iosexportvarResolve =awaitIosexport.rntoiosage (age)
fragmentation, the content of a piece of intermittent rendering.
In fact, SetTimeout gives us a lot of space to optimize interaction.
How to use
SetTimeout is so powerful, do we need to use it heavily in the project? my point of view is very not recommended, in our business, basically prohibit the use of settimeout in the business logic, because I see a lot of ways to use the problem is difficult to solve, settimeout as a hack way.
For example, we use this instance before an instance is initia
the action to be distributed, and then continues to execute.
Wait for a button to click on the action, and then perform the button-click Saga:
while (true) {
Yield take (' Click_button ');
Yield fork (Clickbuttonsaga);
}
blocking calls and Non-blocking calls
Redux-saga can invoke the child saga with fork and call, where Fork is non-blocking and call is a blocking call.
Use examples:
When the user submits the form, we want to do the following things:
L Check some input information (simple, writ
Agreement and provides open source assurance (patent promis).In addition, information about visual Studio Update 4 and the next-generation visual Studio/.net preview was revealed at the conference. The preview version of Visual Studio 2015 and. NET 2015 includes the. NET compiler platform (Complier platform) named "Roslyn", which supports writing IOS, Andro, and Html/javascript in C #, C + +, and ID, Windows, and even other platforms. In addition, th
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. NET this open-source content involves. NET Framework Libraries,. NET Core Framework Libraries and RyuJit VM, all
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