使用mongoose 查詢數(shù)據(jù)列表后修改數(shù)據(jù)不成功
原因是mongoose查出來的數(shù)據(jù)表明是單層對象數(shù)據(jù)，實際它是一個多層對象數(shù)組

  [{
    '$__': InternalCache {
      activePaths: [ctor],
      skipId: true,
      validationError: [Error]
    },
    '$isNew': false,
    _doc: {
      key: 'zhangsan'
    },
    '$errors': { _id: [ValidatorError] },
    key2: 'xinzeng'
  },
  {
    '$__': InternalCache {
      activePaths: [ctor],
      skipId: true,
      validationError: [Error]
    },
    '$isNew': false,
    _doc: {
      key: 'lisi'
  },
  {
    '$__': InternalCache {
      activePaths: [ctor],
      skipId: true,
      validationError: [Error]
    },
    '$isNew': false,
    _doc: {
        key: 'wangwu'
    },
    '$errors': { _id: [ValidatorError] },
    key2: 'xinzeng'
  }
]

所以想要更改數(shù)據(jù)，必須更改_doc對象里面的數(shù)據(jù)，

var result = userCasterList.map((item) => {
        var obj= {...item._doc};
        obj.age = 18;
        return obj;
})
console.log(result);//[{key:'zhangsan',age:18},{key:'lisi',age:18},{key:'wangwu',age:18}]