markdown 无极に引数を渡す

Posted 2021-05-06

function buyAsync(mymoney) {
  return new Promise(function (resolve, reject) {
    setTimeout(function () {
      const payment = parseInt(prompt('支払金額を入力してください'));
      const balance = mymoney - payment;
      if (balance > 0) {
        console.log(`${payment}円を支払いました`);
        resolve(balance);
      } else {
        reject(`残金は${mymoney}円です。購入できません`);
      }
    }, 1000);
  });
}

buyAsync(500)
  .then(function(balance) {
    console.log(`残金は${balance}円です`);
  })
  .catch(function(error) {
    console.log(error);
  });

JS-Promiseに引数を渡す
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