设置超时时间晚于承诺时间

setTimeout(function() {
  console.log(1)
}, 0)

new Promise(function (resolve, reject) {
  resolve(2)
}).then(console.log)

setTimeout(function() {
  console.log(3)
}, 0)

new Promise(function (resolve, reject) {
  resolve(4)
}).then(console.log)

console.log('rush...')