Question

我有一些看似这样的承诺代码。

let residences = await DB.findAll(...);

所以我等待完成续集的承诺然后我打印一些看似承诺的东西。

console.log(residences);
[ { dataValues: 
 { id: 1,
   address: '6509 Pardall Rd',
   city: 'Goleta',
   state: 'CA',
   zipcode: '93117',
   user_id: 4,
   category: 'apartment',
   amenities: null,
   created_at: Wed Mar 09 2016 22:26:09 GMT-0800 (PST),
   updated_at: Wed Mar 09 2016 22:26:09 GMT-0800 (PST),
   room_count: '1',
   'room_types.name': 'living' },
_previousDataValues: 
 { id: 1,
   address: '6509 Pardall Rd',
   city: 'Goleta',
   state: 'CA',
   zipcode: '93117',
   user_id: 4,
   category: 'apartment',
   amenities: null,
   created_at: Wed Mar 09 2016 22:26:09 GMT-0800 (PST),
   updated_at: Wed Mar 09 2016 22:26:09 GMT-0800 (PST),
   room_count: '1',
   'room_types.name': 'living' },
_changed: {},
'$modelOptions': 
 { timestamps: true,
   instanceMethods: {},
   classMethods: {},
   validate: {},
   freezeTableName: false,
   underscored: true,
   underscoredAll: false,
   paranoid: false,
   whereCollection: null,
   schema: null,
   schemaDelimiter: '',
   defaultScope: {},
   scopes: [],
   hooks: {},
   indexes: [],
   name: [Object],
   omitNull: true,
   sequelize: [Object],
   uniqueKeys: {},
   hasPrimaryKeys: true },
'$options': 
 { isNewRecord: false,
   '$schema': null,
   '$schemaDelimiter': '',
......

但是如果我解析对象，我会得到我希望返回的承诺。

console.log(JSON.stringify(residences));
[
    {
    "id": 1,
    "address": "6509 Pardall Rd",
    "city": "Goleta",
    "state": "CA",
    "zipcode": "93117",
    "user_id": 4,
    "category": "apartment",
    "amenities": null,
    "created_at": "2016-03-10T06:26:09.091Z",
    "updated_at": "2016-03-10T06:26:09.091Z",
    "room_count": "1",
    "room_types.name": "living"
  }
]

为什么这两条打印线会输出如此截然不同的文字？

Answer 1

console.log()打印在您的情况下提供的对象的完整结构。但JSON.stringify()函数忽略所有不可枚举的键。有关详细说明，请转到 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify 希望它有所帮助

解析时为什么续集承诺的输出会有所不同

1 个答案: