async和await常用

async addbutton() {
  await this.showawait();
  // await
  // await Promise.then(resolve => {
  //   console.log('111');
  // })
  console.log('333')
  // const result = this.showasync();
  // console.log(result);
},
showawait() {
  // return new Promise((resolve, reject) => {
  //   setTimeout(()=> {
  //   console.log('111')
  // })
  // })
  // setTimeout(()=> {
  //   console.log('111')
  // })
  return new Promise((resolve, reject) => {
    console.log('111')
    resolve('222')
  }).then(res => {
    console.log(res);
  })
},