是否存在由 setTimeout 定义的函数在下一个即时报价之前不会执行的情况？

Question

我正在阅读https://nodejs.dev/en/learn/understanding-process-nexttick/最后一句话是：

当您希望确保在下一个事件循环迭代中该代码已经执行时，请使用nextTick((。

但在此之前，它说：

调用setTimeout(((=>｛｝，0(将在下一个刻度结束时执行该函数，比使用nextTick((时要晚得多，后者会优先考虑调用并在下一刻度开始前执行。

现在我有点困惑，为什么要使用nextTick()来确保代码在下一次勾选之前已经执行？setTimeout()中定义的代码是否不能保证执行？

Answer 1

setTimeout(((=>｛｝，0(将在nextTick((之后执行函数

setTimeout(((=>｛｝，0(执行需要时间，您可以在下面的输出中看到差异。

//setTimeout  
setTimeout(() => {
console.log('Executed this in the next iteration');
}, 0);
console.log('Executed this in the current iteration');
//See Output ----->
Executed this in the current iteration
connected to port: 2020
Executed this in the next iteration

nextTick((对调用进行优先级排序，并在下一个tick开始之前执行它。

//nextTick
process.nextTick(() => {
console.log('Executed this in the next iteration');
});
console.log('Executed this in the current iteration');
//See Output ----->
Executed this in the current iteration
Executed this in the next iteration
connected to port: 2020