小编kyl*_*jw2的帖子

const backend = (num) => {
  const someVar = new Promise((resolve, reject) => {
    if (num % 2 === 0) {
      resolve(`The number, ${num}, is even.`);
    } else {
      reject(`The number, ${num}, is odd.`);
    }
  })
  return someVar;
}
const builtInFuncs = (num) => {
  backend(num)
    .then(message => console.log(message))
    .catch(message => console.log(message));
}
const asyncAwait = async(num) => {
  try {
    const response = await backend(num);
    console.log(response);
  } catch (error) {
    console.log(error);
  }
}

builtInFuncs(2); …