Mongoose bcrypt设置密码并异步保存

const mongoose = require('mongoose');
const bcrypt = require('bcrypt');

const userSchema = new mongoose.Schema({
  username: String,
  password: String
});

userSchema.pre('save', async function(next) {
  const user = this;
  if (!user.isModified('password')) return next();

  try {
    const salt = await bcrypt.genSalt(10);
    const hash = await bcrypt.hash(user.password, salt);
    user.password = hash;
    next();
  } catch (error) {
    return next(error);
  }
});

const User = mongoose.model('User', userSchema);

const user = new User({
  username: 'example',
  password: 'password123'
});

user.save((error, savedUser) => {
  if (error) {
    console.error(error);
  } else {
    console.log('User saved successfully:', savedUser);
  }
});