web-worker

问题 I am using shared webworkers, I am not getting the errors from the worker. The worker error handler not returning any errors!. How can I Debug shared webworkers. var worker = new SharedWorker('Vult_worker.js'); worker.port.start(); worker.port.onerror = function(e) { consloe.log('ERROR: Line ', e.lineno, ' in ', e.filename, ': ', e.message); } worker.port.onmessage = function(e) { console.log(e.data); }; worker.port.postmessage(); worker Code: onconnect = function(e) { var self = e.ports[0];

问题 I am using shared webworkers, I am not getting the errors from the worker. The worker error handler not returning any errors!. How can I Debug shared webworkers. var worker = new SharedWorker('Vult_worker.js'); worker.port.start(); worker.port.onerror = function(e) { consloe.log('ERROR: Line ', e.lineno, ' in ', e.filename, ': ', e.message); } worker.port.onmessage = function(e) { console.log(e.data); }; worker.port.postmessage(); worker Code: onconnect = function(e) { var self = e.ports[0];

问题 I have a script on foreground tab that starts (dedicated) web worker. Now I see that setTimeout(xxx, 100) in that web worker is limited to be triggered not more often than once per second instead of 10 times per second as required. I've googled such a limitation for inactive tabs but are there any docs that say the same about Web Workers? I've checked this in Chrome and Firefox. 回答1: There is no real specs about that throttling behavior, even though they do allow it: Optionally, wait a

问题 I have a script on foreground tab that starts (dedicated) web worker. Now I see that setTimeout(xxx, 100) in that web worker is limited to be triggered not more often than once per second instead of 10 times per second as required. I've googled such a limitation for inactive tabs but are there any docs that say the same about Web Workers? I've checked this in Chrome and Firefox. 回答1: There is no real specs about that throttling behavior, even though they do allow it: Optionally, wait a

问题 I have a Worker that shares a SharedArrayBuffer with the "main thread". To work correctly, I have to make sure that the worker has access to the SAB before the main thread accesses to it. (EDIT: The code creating the worker has to be in a seperate function (EDIT2: which returns an array pointing to the SAB).) (Maybe, already this is not possible, you'll tell me). The initial code looks like this: function init() { var code = `onmessage = function(event) { console.log('starting'); var buffer

问题 Recently I worked on a library that supports using workers for some heavy lifting. I found out that, at least on most online code editors (snippets/jsfiddle/codepen/glitch) I can't seem to load a worker from another domain. I get a security error (or in firefox silent failure) function startWorker(url) { try { const worker = new Worker(url); console.log('started worker'); worker.onmessage = e => log('black', e.data); worker.postMessage('Hi from page'); } catch (e) { console.error('could not

问题 Recently I worked on a library that supports using workers for some heavy lifting. I found out that, at least on most online code editors (snippets/jsfiddle/codepen/glitch) I can't seem to load a worker from another domain. I get a security error (or in firefox silent failure) function startWorker(url) { try { const worker = new Worker(url); console.log('started worker'); worker.onmessage = e => log('black', e.data); worker.postMessage('Hi from page'); } catch (e) { console.error('could not

问题 I have two videos here showing the rendering of a decoded MJPEG video sequence this one only rending one video: Video description: Left (Source), Middle (Canvas copy of stream), Right (Decoded from network). At this point the video is smooth both from source to network and back (websocket). And at least up to 5 video decoded and rendered is reasonably smooth. However if I render like 20 videos things start to lag: My question is what is the best algorithm that will allow to render (or in

问题 Webworkers can fetch regular images through XMLHttpRequest , right? How can the workers then draw these images to OffscreenCanvas? Probably want to use XMLHttp.responseType = 'blob' ? Another way would be to set the src of an image element and then transfer the element to worker, but my workers always reject such images. Thanks 回答1: The ImageBitmap API is here for this purpose (among others). Note: this demo will currently run only on Chrome... const offcanvas = canvas

问题 I am trying to write a web worker that performs an interruptible computation. The only way to do that (other than Worker.terminate() ) that I know is to periodically yield to the message loop so it can check if there are any new messages. For example this web worker calculates the sum of the integers from 0 to data , but if you send it a new message while the calculation is in progress it will cancel the calculation and start a new one. let currentTask = { cancelled: false, } onmessage =