promise

promise的链式调用

const myPromise =
  (new Promise(myExecutorFunc))
  .then(handleFulfilledA,handleRejectedA)
  .then(handleFulfilledB,handleRejectedB)
  .then(handleFulfilledC,handleRejectedC);
// 或者，这样可能会更好...
const myPromise =
  (new Promise(myExecutorFunc))
  .then(handleFulfilledA)
  .then(handleFulfilledB)
  .then(handleFulfilledC)
  .catch(handleRejectedAny);