Web Workers：SetInterval和SetTimeout可靠性 [英] Web Workers: SetInterval and SetTimeout reliability

问题描述

在浏览器环境中， setTimeout 和 setInterval 在准确性方面不可靠 - 时间敏感度是一个问题。

In a browser environment, setTimeout and setInterval aren't reliable for accuracy - where time sensitivity is an issue.

最近，我们获得了 requestAnimationFrame ，这使我们能够做得更好（就 performance.now（）及其时间戳）。

Recently, we've been given requestAnimationFrame, which allows us to do a little better (in terms of performance.now() and its timestamps).

长话短说 - 我决定用Javascript构建一个节拍器虽然它有效，但它在某个节奏之上是相当不准确的。虽然补偿后期帧可以使节奏不随时间变化，但是个别节拍略微偏离，这对节拍器不起作用。 （这对于动画来说不是问题，因为它本质上不需要是离散的。）

Long story short - I decided to build a metronome in Javascript, and while it works, it's fairly inaccurate above a certain tempo. While compensating for late frames allows the tempo not to desync over time, the individual beats are slightly off, which doesn't work for a metronome. (This is not a problem for animation, as it by nature doesn't need to be discrete.)

现在，我可以选择尝试执行前瞻基于我指定的阈值，尝试在可用帧之间放置点击（在动画循环中使用 setTimeout ）。但我想，由于事件循环，我会遇到类似的问题，因为 setTimeout 在浏览器中不可靠，除非HTML5 Audio API允许你延迟播放几毫秒。

Right now, I have the option of attempting to perform a lookahead based on a threshold that I specify, to attempt to place the click between available frames (using setTimeout in the animation loop). I imagine, though, that I'll run into similar problems as setTimeout isn't reliable in the browser due to the event loop, unless the HTML5 Audio API will allow you to delay playback by a number of milliseconds.

我的问题： setTimeout 和 setInterval 在Web工作者和浏览器环境中更准确可靠吗？

My question: Are setTimeout and setInterval more accurate and reliable in a web worker vs the browser environment?

推荐答案

我们可以说'是'对于你的问题，Web worker对settimeout和setinterval函数是可靠的，因为web worker根据ui在后台运行，因此它们为你提供非阻塞的ui事件（它们可能会影响节拍器速度），同时你正在处理持续的节拍器时序。

We can say 'yes' for your question, Web workers are reliable for settimeout and setinterval functions,because web workers runs on background according to ui, so they provide you non-blocking ui events(they might affect metronome tempo), while you are processing the continuing metronome timing.

顺便说一下，在此处。

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