Promise.resolve().then(() => {
  console.log(0)
  return Promise.resolve(4)
}).then((res) => {
  console.log(res)
})

Promise.resolve().then(() => {
  console.log(1)
}).then(() => {
  console.log(2)
}).then(() => {
  console.log(3)
}).then(() => {
  console.log(5)
}).then(() =>{
  console.log(6)
})