node 笔记：event loop

参考 ：https://nodejs.dev/learn/the-nodejs-event-loop

Message Queue : 老同志了。click event ，setTimeout，这些 就是他默默在支持，性子比较平和，别人插队他就默默等着

Job Queue / ES6 Job Queue： 新人，时髦的Promise 就是他的杰作，性子急躁，不许别人插队。

const bar = () => console.log('bar')

const baz = () => console.log('baz')

const foo = () => {
  console.log('foo')
  setTimeout(bar, 0)
  baz()
}

foo()

terminal:

foo
baz
bar

const bar = () => console.log('bar')

const baz = () => console.log('baz')

const foo = () => {
  console.log('foo')
  setTimeout(bar, 0)
  new Promise((resolve, reject) =>
  {
    console.log("before resolve")
    resolve('should be right after baz, before bar')
    console.log("after resolve")
  }
  ).then(resolve => console.log(resolve))
  baz()
}

foo()

terminal:

foo
before resolve
after resolve
baz
should be right after baz, before bar
bar