resolve和reject

1、Promise.resolve(value)

Promise.resolve("fulfiled").then((value) => {
  console.log("onResolve: ", value);
});

2、Promise.reject(reason)

• 有onRejected时，优先执行onRejected，不再执行catch

Promise.reject("fulfiled")
  .then(
    (value) => {
      console.log("onResolve: ", value);
    },
    (reason) => {
      console.log("onRejected: ", reason);
    }
  )
  .catch((err) => {
    console.log("catch: ", err);
  });

输出：

onRejected:  fulfiled

• 无onRejected时，执行catch

Promise.reject("fulfiled")
  .then((value) => {
    console.log("onResolve: ", value);
  })
  .catch((err) => {
    console.log("catch: ", err);
  });

输出：

catch:  fulfiled