promise

promise
unresolved 等待任务完成
resolve 任务完成，没有出错 then
reject 任务完成出错 catch

let promise = new Promise((resolve,reject) => {
    // resolve();
    reject();
 });
//  console.log(promise);

promise
  .then(() => console.log("good"))
  .then(() => console.log("good"))
  .catch(() => console.log("BAD"))