function runTask(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 off our tasks in parallel is the easy bit. All we need to do is not ...
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...
return new Promise(function(resolve, reject) { setTimeout(function() { string += 'bar'; resolve(string); }, 5000); }).then(value => console.log("1")); }) // 2. receive "foobar", register a callback function to work on that string ...
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...
The setTimeout function 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...
// Decode asynchronously request.onload = function() { context.decodeAudioData(request.response, function(buffer) { dogBarkingBuffer = buffer; }, onError); } request.send(); } 音频文件数据为二进制(非文本),所以我们设置要求responseType是“arraybuffer”。
* 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) { ...
fetch(url).then(function(){// handle the response}).catch(function(){// handle the error}); Copy The API you call usingfetch()may be down or other errors may occur. If this happens, therejectpromise will be returned. Thecatchmethod is used to handlereject. The code withincatch()will...
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 ...
d - Done function, it's for tests that need to be run asynchronously. You may pass additional block of tests to this function and they'll be run right after. d argument makes no sense for synchrounous tests, declare such tests without it. All arguments are optional, and by the way ...