Question

我有两个for循环，它们应该反汇编一个对象并以特殊方式写入一个新对象。但由于某种原因，我的对象数据被覆盖，最终结果只是最后一个条目。这是我的代码：

let j = 0, k = 0, tempCities = [];    
for (let stateKey in this.countries[countryKey].states) {
      if (this.countries[countryKey].states.hasOwnProperty(stateKey)) {
        this.states[j] = this.states[stateKey].name;

        for (let cityKey in this.states[stateKey].cities) {
          if (this.states[stateKey].cities.hasOwnProperty(cityKey)) {
            tempCities[k] = this.cities[cityKey].name;
          }
          k++;
        }

        k = 0;
        this.cities[this.states[j]] = tempCities;
      }

      j++;
    }

问题是这个在外循环this.cities[this.states[j]] = tempCities

的迭代中会被覆盖

我需要让对象键为this.states[j]，并且我需要拥有所有这些，而不需要覆盖。

如何解决此问题的任何建议都将受到高度赞赏！

此外，以下是我尝试使用的示例数据（来自Firebase）

{
    "cities": {
        "-KuzIBwGCbJhAswAcOTk": {
            "cityCounter": 1,
            "name": "Sceaux-du-Gâtinais",
            "state": "-KuzIBslq88OXpE_L0iy"
        },
        "-Kv1e75Dd2pjnropd63W": {
            "cityCounter": 1,
            "name": "Labelle",
            "state": "-Kv1e724mJTS-6E_DZh1"
        },
    },
    "countries": {
        "-KuzIBoxiP2oksxhxFX6": {
            "countryCounter": 1,
            "name": "France",
            "states": {
                "-KuzIBslq88OXpE_L0iy": true
            }
        },
        "-Kv1e6wxA9RwYyEYO27e": {
            "countryCounter": 2,
            "name": "United States",
            "states": {
                "-Kv1e724mJTS-6E_DZh1": true
            }
        }
    },
    "states": {
        "-KuzIBslq88OXpE_L0iy": {
            "cities": {
                "-KuzIBwGCbJhAswAcOTk": true
            },
            "country": "-KuzIBoxiP2oksxhxFX6",
            "name": "Centre Region",
            "stateCounter": 1
        },
        "-Kv1e724mJTS-6E_DZh1": {
            "cities": {
                "-Kv1e75Dd2pjnropd63W": true,
                "-Kv1eEb3D4pqd7l14KCg": true
            },
            "country": "-Kv1e6wxA9RwYyEYO27e",
            "name": "FL",
            "stateCounter": 2
        }
    }
}

Answer 1

您需要压缩数据，如下所示：

{
    "coutries": {
        "-JiGh_31GA20JabpZBfa": {
            "name": "United States",
            "states": {
                "-JiGh_31GA20JabpZBfb": true
            }
        }
    },
    "states": {
        "-JiGh_31GA20JabpZBfb": {
            "name": "Florida",
            "country": "-JiGh_31GA20JabpZBfa",
            "cities": {
                "-JiGh_31GA20JabpZBfc": true
            }
        }
    },
    "cities": {
        "-JiGh_31GA20JabpZBfc": {
            "name": "Miami",
            "state": "-JiGh_31GA20JabpZBfb",
            "visited_by": {
                "P1yjH4GgcFQcJUHULmTgMLC68w64": true
            }
        }
    },
    "users": {
        "P1yjH4GgcFQcJUHULmTgMLC68w64": {
            "cities_visited": {
                "-JiGh_31GA20JabpZBfc": true
            }
        }
    }
}

使用循环时，Javascript对象会被覆盖

1 个答案: