JavaScript的：如何编写将异步执行的功能？ [英] Javascript: How to write a function that will be executed asynchronously?

问题描述

我有code的几行，我想在Javascript异步运行，以便它不是我的主要算法放缓。看到这个伪code：

I have a few lines of code that I want to run asynchronously in Javascript so that it doesn't slow down my main algorithm. See this pseudo code:

//main algorithm with critical code that should run as soon as possible
...
...
runInParallel(function(){
  //time consuming unimportant code to shows some progress feedback to user
  ...
}
//the rest of the time critical algorithm
...
...
runInParallel(function(){
  //time consuming unimportant code to shows some progress feedback to user
  ...
}
//and so on and so forth

我搜索＃1怎么写异步code在Javascript但下面的问题是不是与我的类似：

I searched Stackoverflow for how to write asynchronous code in Javascript but the following questions are not similar to mine:

• how异步运行JavaScript函数，而无需使用setTimeout的：它是关于服务器端


• Loading异步JavaScript的 - 怎么做回调：这是关于加载源$ C ​​$ C

• how to run a javascript function asynchronously, without using setTimeout?: it's about server side
• Loading javascript asynchronously - How to do callbacks?: it's about loading source code

我想我可以使用定时器用于这一目的。我要的是能够有效运行code并行与我的主要算法具有较低优先级如果有可能的功能runInParallel（）的主体。有人吗？

I guess I can use timers for this purpose. All I want is the body of the function runInParallel() that runs a code efficiently in parallel with my main algorithm with lower priority if possible. Anyone?

推荐答案

JavaScript有没有同步/线程管理。如果你想异步执行的东西，你可以使用的setTimeout 用相结合的回调时得到通知功能的完成。

Javascript has no synchronization / thread management. If you wish to execute something asynchronously, you can use setTimeout combined with a callback to be notified when the function 's finished.

 var asyncHandle = setTimeout(function () { asyncCode(); callback(); }, 10);

的 asyncHandle 可用于取消超时被调用的函数之前。

The asyncHandle can be used to cancel the timeout prior to the function being called.

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