将此基于 Promise 的代码转换为 Async / Await？

Question

同事想把一个项目的后端代码重构为Async/Await，我几乎没用过。

我知道它是如何工作的，但是在开始时以这种方式编写代码有点奇怪。

router.post("/register", async (req, res) => {
  const { firstName, lastName, email, password } = req.body;

  bcrypt.hash(password, 10).then((hash) => {
    User.create({
      firstName: firstName,
      lastName: lastName,
      email: email,
      password: hash,
    });
    res.json("User created!");
  });
});

例如，您将如何重构这段简单的代码？ 谢谢！！！

Answer 1

大概是这样的：

router.post("/register", async (req, res) => {
    const { firstName, lastName, email, password } = req.body;
    
    const hash = await bcrypt.hash(password, 10);
    User.create({
        firstName: firstName,
        lastName: lastName,
        email: email,
        password: hash,
    });
    res.json("User created!");
});

Answer 2

您可以通过在调用哈希函数时简单地添加 await 来做到这一点

router.post("/register", async (req, res) => {
  const { firstName, lastName, email, password } = req.body;

  try {
    const hash = await bcrypt.hash(password, 10);
    User.create({
      firstName: firstName,
      lastName: lastName,
      email: email,
      password: hash,
    });
  } catch (e) {
    // --- "your .catch() method would go here" ---
  }

  res.json("User created!");
});