js异步解决

• https://segmentfault.com/a/1190000012738395

async function main() {
  let docs = [{}, {}, {}];

  docs.forEach(async function (doc) {
    await post(doc);
    console.log('main');
  });
}
function post(){
  return new Promise((resolve) => {
    setTimeout(resolve, 1000);
  });
}