synchronous

问题 While i'm studying https://nodejs.org/api/process.html#process_process_nexttick_callback_arg , i'm stucked at a point. I'm quoting it below : It is very important for APIs to be either 100% synchronous or 100% asynchronous. Consider this example: // WARNING! DO NOT USE! BAD UNSAFE HAZARD! function maybeSync(arg, cb) { if (arg) { cb(); return; } fs.stat('file', cb); This API is hazardous because in the following case: maybeSync(true, () => { foo(); }); bar(); It is not clear whether foo() or

问题 I have two functions. I call trendyolStocksUpdate() function several times with a loop inside syncTrendyolOFFStocks() function. I used async/await but trendyolStocksUpdate() function is not called sequentially. It runs simultaneously. What is wrong with my code ? Below are the two functions: async function syncTrendyolOFFStocks(){ //This function sends "out of stock products" one by one //to trendyolStocksUpdate function, so they their quantity will be initalized to 0 //For example, T-Shirt

问题 I'm writing an automated test script using TestCafe and Node.JS. One of the tests is to download a file and validate that the download is complete. I don't want to write a hard coded await t.wait(4000); because since my test is based on a data driven framework I can feed it lots of data with lots of different files and file types. So the file size could vary by extreme amounts from a few Kilobytes to Gigabytes. So writing await t.wait(4000); might work for one test case but will almost

问题 I'm writing an automated test script using TestCafe and Node.JS. One of the tests is to download a file and validate that the download is complete. I don't want to write a hard coded await t.wait(4000); because since my test is based on a data driven framework I can feed it lots of data with lots of different files and file types. So the file size could vary by extreme amounts from a few Kilobytes to Gigabytes. So writing await t.wait(4000); might work for one test case but will almost

问题 I have a setup with a traditional form that's checked with jQuery Tools validator and submitted via POST. I like that this class does not require extra classnames or other superfluous metadata to validate, standard HTML5 attributes are enough. I now would like to extend this functionality with the Plupload upload solution. I know that all modern upload solutions work via Ajax these days, so I was thinking about a setup in which the user fills out the form, puts files in the upload queue and

问题 My problem is quite simple but I can't find anything online. I am finishing development of a phone app, and I am having some issues with Cordova because of the not-synchronous execution. As it is right now, I have to do something like this: var finishedFl = 0; cordova.exec( function(info) { .... [Function goes here] finishedFl = 1; }, function (info) { alert('Error'); }, 'Smapps', 'getInfo', []); While(finishedFl != 1){ wait; } anotherFunction(); I find this way of programming extremely

问题 I'm trying to mock out a method which takes a long time for testing purposes but can't find a good way to do this in Javascript. Any good approaches besides writing a very long for loop? 回答1: How about a loop that checks time? function sleep(milliSeconds){ var startTime = new Date().getTime(); // get the current time while (new Date().getTime() < startTime + milliSeconds); // hog cpu until time's up } 回答2: You could make a synchronous AJAX call to a server which defers the response by a

问题 Hmm. I'm using setState and for some reason the code following it doesn't have access to the new state! What gives?! 回答1: Yeap. It's asynchronous. I'm posting this because this isn't really immediately obvious to new React users. React "queues" updates to a component's state. If you need to execute a code block that's dependent on the new state change, pass a callback like so: getInitialState: function () { return { isFinalCountdown: false, } } //blablabla //then somewhere you got... this

问题 Is there a way to load and execute a javascript file in a synchronous way just like a synchronous XMLHttpRequest? I'm currently using a sync XMLHttpRequest and then eval for this, but debugging that code is very difficult... Thanks for your help! Update I tried this now: test.html <html> <head> <script type="text/javascript"> var s = document.createElement("script"); s.setAttribute("src","script.js"); document.head.appendChild(s); console.log("done"); </script> </head> <body> </body> </html>

问题 Is there a way to load and execute a javascript file in a synchronous way just like a synchronous XMLHttpRequest? I'm currently using a sync XMLHttpRequest and then eval for this, but debugging that code is very difficult... Thanks for your help! Update I tried this now: test.html <html> <head> <script type="text/javascript"> var s = document.createElement("script"); s.setAttribute("src","script.js"); document.head.appendChild(s); console.log("done"); </script> </head> <body> </body> </html>