微任务宏任务

案例1

process.nextTick(() => {console.log('111');});

const promise = new Promise(resolve => {
  console.log('222');
  resolve();
});

setTimeout(() => {console.log('333');}, 100);

promise.then(() => {console.log('444');});

案例2

Promise.resolve().then(() => {console.log('111');});

process.nextTick(() => {
  console.log('222');
})

setTimeout(() => {
  console.log('333');
}, 0)

console.log('444');

案例3

console.log('111')

setTimeout(() => {
  console.log('222') 
}, 0)

new Promise((resolve) => {
    console.log('333')
    resolve()
})
.then(() => {
  console.log('444')
})
.then(() => {
  console.log('555')
})

console.log('666')

案例4

process.nextTick(() => {
  console.log('111');
});
setTimeout(() => {
  console.log('222');
}, 0);
const promise = Promise.resolve();
promise
  .then(() => {
    console.log('333');
    process.nextTick(() => {
      console.log('444');
    });
    setTimeout(() => {
      console.log('555');
    }, 0);
  })
  .catch(() => {
    console.log('666');
  })
  .catch(() => {
    console.log('777');
  })