functionrunTask(spec){return(spec.task==='wait')?asyncTimeout(spec.duration):asyncFetch(spec.url);} Let’s see how we’d run these tasks in parallel and in sequence. A parallel solution Kicking offour tasks in parallel is the easy bit. All we need to do isnotadd anawaitwhen we mak...
window.interopFunctions = { clickElement : function (element) { element.click(); } } To call a JS function that doesn't return a value, use JSRuntimeExtensions.InvokeVoidAsync. The following code triggers a client-side click event by calling the preceding JS function with the capture...
(url) { var request = new XMLHttpRequest(); request.open('GET', url, true); request.responseType = 'arraybuffer'; // Decode asynchronously request.onload = function() { context.decodeAudioData(request.response, function(buffer) { dogBarkingBuffer = buffer; }, onError); } request.send()...
function of theunloadevent orbeforeunloadHowever, this is not very reliable, because theXMLHttpRequestobject is sent asynchronously. It is possible that when it is about to be sent, the page and related resources have been unloaded, which will causefunction not found, which will cause the ...
ThesetTimeoutfunction is probably the simplest way to asynchronously schedule code to run in the future: // Say "Hello."console.log("Hello.");// Say "Goodbye" two seconds from now.setTimeout(function() {console.log("Goodbye!"); },2000);// Say "Hello again!"console.log("Hello again...
* It uses a JavaScript Promise to return the results asynchronously. * The returned User object has a profile property which contains * the claims for the user. * Add this code to detect if the user is logged into * the JavaScript application: */ mgr.getUser().then(function (user) { ...
JavaScript is evaluated asynchronously without blocking UI thread. Result is returned in the UI thread. It is required to callevaluateandcallFunctionin UI thread. JavaScript is evaluated in new context Each time the JavaScript is evaluated in the new context. It can not access the result of a ...
Many pages load scripts asynchronously, but there is no way to tell when they're done doing so, and thus when it's a good time to run your code and inspect the resulting DOM structure. This is a fundamental limitation; we cannot predict what scripts on the web page will do, and so ...
但是这并不意味着当 c1 返回值时,task 2必须已经完成了。 现在来讨论最重要的细节 We are now ready to discuss the final detail that you need to understand to really master Promises. When you pass a callbackcto thethen()method,then()returns a Promisepand arranges to asynchronously invokecat some...
In an async function, whatever value is returned with thereturnkeyword (orundefinedif there is noreturn) will be effectively converted into a promise object withPromise.resolve(). An async function will always return a promise object. Outside the function, the evaluated function will be this pro...