setimmediate

When you want to execute some piece of code asynchronously, but as soon as possible, one option is to use the setImmediate() function provided by Node.js:

当您要异步执行某些代码但要尽快执行时，一种选择是使用Node.js提供的setImmediate()函数：

setImmediate(() => {  //run something})

Any function passed as the setImmediate() argument is a callback that’s executed in the next iteration of the event loop.

作为setImmediate()参数传递的任何函数都是在事件循环的下一次迭代中执行的回调。

How is setImmediate() different from setTimeout(() => {}, 0) (passing a 0ms timeout), and from process.nextTick()?

setImmediate()与setTimeout(() => {}, 0) (传递0ms超时)和process.nextTick()有何不同？

A function passed to process.nextTick() is going to be executed on the current iteration of the event loop, after the current operation ends. This means it will always execute before setTimeout and setImmediate.

当前操作结束后，将在事件循环的当前迭代中执行传递给process.nextTick()函数。 这意味着它将始终在setTimeout和setImmediate之前执行。

A setTimeout() callback with a 0ms delay is very similar to setImmediate(). The execution order will depend on various factors, but they will be both run in the next iteration of the event loop.

延迟为0ms的setTimeout()回调与setImmediate()非常相似。 执行顺序将取决于各种因素，但是它们都将在事件循环的下一次迭代中运行。

翻译自:

setimmediate