javascript nodejs事件循环测试

Posted 2021-05-04

var p = new Promise(resolve => {
  console.log('promise body');
  setTimeout(_ => {
    console.log('promise body settimeout')
  })
  process.nextTick(_ => {
    console.log('promise nextTick')
  })
  resolve('promise callback')
})

setTimeout(_ => {
  console.log('setTimeout');
});

setImmediate(_ => {
  console.log('setImmediate');
})

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

p.then(data => {
  console.log(data);
  return data + ' next promise return'
}).then(data => {
  console.log(data)
})