在JavaScript中，如何从其事件函数中访问setTimeout / setInterval调用的id？ [英] In JavaScript, how can I access the id of setTimeout/setInterval call from inside its event function?

问题描述

如何从其事件函数中访问setTimeout / setInterval调用的进程id，因为Java线程可能会访问自己的线程ID？

How can I access the process id of setTimeout/setInterval call from inside its event function, as a Java thread might access its own thread id?

var id = setTimeout(function(){
    console.log(id); //Here
}, 1000);
console.log(id);

推荐答案

该代码将按原样运行，因为 setTimeout 在调用提供的回调之前始终将返回，即使您传递的超时值非常小，为零或为负。

That code will work as-is, since setTimeout will always return before invoking the provided callback, even if you pass a timeout value which is very small, zero, or negative.

> var id = setTimeout(function(){
      console.log(id);
  }, 1);
  undefined
  162
> var id = setTimeout(function(){
      console.log(id);
  }, 0);
  undefined
  163
> var id = setTimeout(function(){
      console.log(id);
  }, -100);
  undefined
  485

问题是我的计划有许多同时安排的匿名操作，因此他们无法从同一个变量加载他们的id。

Problem is I plan to have many concurrently scheduled anonymous actions, so they can't load their id from the same variable.

当然可以。

(function () {
  var id = setTimeout(function(){
    console.log(id);
  }, 100);
})();

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