如何在GHCJS程序中定期执行操作？ [英] How to execute an action periodically in a GHCJS program?

问题描述

应该通过Javascript使用 setInterval 还是使用基于线程的一些惯用解决方案？

Should one use setInterval via Javascript, or use some more idiomatic solution based on threads?

推荐答案

使用 setInterval posed 和来自亚历山大，Erik和路易斯自己的评论让我尝试线程。这工作无缝，非常干净的代码类似于以下：

Using setInterval posed some challenges and comments from Alexander, Erik and Luite himself led me to try threads. This worked seamlessly, with very clean code similar to the following:

import Control.Concurrent( forkIO, threadDelay )
import Control.Monad( forever )

... within an IO block
threadId <- forkIO $ forever $ do
  threadDelay (60 * 1000 * 1000) -- one minute in microseconds, not milliseconds like in Javascript!
  doWhateverYouLikeHere

Haskell具有轻量级线程的概念，因此这是习惯Haskell的运行方式以异步方式执行操作，如同使用Javascript setInterval 或 setTimeout 。

Haskell has the concept of lightweight threads so this is the idiomatic Haskell way to run an action in an asynchronous way as you would do with a Javascript setInterval or setTimeout.

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