在process.nextTick（）函数之后没有调用setImmediate（）函数

Question

对于此片段：

const foo = [1, 2];
const bar = ['a', 'b'];

foo.forEach( num => {
  console.log(`setting setImmmediate ${num}`);
  setImmediate(() => {
    console.log(`running setImmediate ${num}`);
    bar.forEach(char => {
      console.log(`setting nextTick ${char}`);
      process.nextTick(() => {
        console.log(`running nextTick ${char}`);
      })
    })
  });
} )

输出是

$ node scratch.js                   
setting setImmmediate 1
setting setImmmediate 2
running setImmediate 1
setting nextTick a
setting nextTick b
running setImmediate 2
setting nextTick a
setting nextTick b
running nextTick a
running nextTick b
running nextTick a
running nextTick b

来自docs

无论事件循环的当前阶段如何，nextTickQueue将在当前操作完成后处理。

据我了解，qazxsw poi将添加到当前事件qazxsw poi，并在当前事件之后立即执行，无论事件循环处于什么阶段。

它的输出不应该如下吗？

process.nextTick()

Answer 1

无论事件循环的当前阶段如何，nextTickQueue将在当前操作完成后处理。

我误解了nextTickQueue认为“当前操作”意味着当前处理事件，实际上它意味着当前处理阶段。

来自Danial Khan的

setting setImmmediate 1
setting setImmmediate 2
running setImmediate 1
setting nextTick a
setting nextTick b
running nextTick a
running nextTick b
running setImmediate 2
setting nextTick a
setting nextTick b
running nextTick a
running nextTick b

/：

event loop documentation