访问json数据中的内部键

Question

我有以下对象

{
    "Monday": [
        {
            "morning": [
                {
                    "start_time": "02:00",
                    "end_time": "07:30"
                }
            ],
            "afternoon": [
                {
                    "start_time": "02:00",
                    "end_time": "05:00"
                }
            ],
            "evening": [
                {
                    "start_time": "02:30",
                    "end_time": "07:00"
                }
            ]
        }
    ],
    "Tuesday": [
        {
            "morning": [
                {
                    "start_time": "02:00",
                    "end_time": "07:30"
                }
            ],
            "afternoon": [
                {
                    "start_time": "02:00",
                    "end_time": "05:00"
                }
            ],
            "evening": [
                {
                    "start_time": "02:30",
                    "end_time": "07:00"
                }
            ]
        }
    ],
..
}

我想循环遍历所有对象键和值

for (var prop in this.jsonData) {
  console.log("Key:" + prop);
  console.log("Value:" + this.jsonData[prop]);
}

得到

键：周一值：未定义

但我需要访问内部对象值

Answer 1

要访问内部对象值，您还需要循环访问内部数组。这是示例代码：

Object.entries(this.jsonData).forEach(([day, dayData]) => {
  console.log("Day:", day);
  const timePeriods = dayData[0];

  Object.entries(timePeriods).forEach(([timePeriod, slots]) => {
    console.log("  Time Period:", timePeriod);

    slots.forEach(({ start_time, end_time }, i) => {
      console.log(`    Slot ${i + 1}`);
      console.log("      Start Time:", start_time);
      console.log("      End Time:", end_time);
    });
  });
});

const jsonData = {
  Monday: [
    {
      morning: [
        {
          start_time: "02:00",
          end_time: "07:30",
        },
      ],
      afternoon: [
        {
          start_time: "02:00",
          end_time: "05:00",
        },
      ],
      evening: [
        {
          start_time: "02:30",
          end_time: "07:00",
        },
      ],
    },
  ],
  Tuesday: [
    {
      morning: [
        {
          start_time: "02:00",
          end_time: "07:30",
        },
      ],
      afternoon: [
        {
          start_time: "02:00",
          end_time: "05:00",
        },
      ],
      evening: [
        {
          start_time: "02:30",
          end_time: "07:00",
        },
      ],
    },
  ],
};

Object.entries(jsonData).forEach(([day, dayData]) => {
  console.log("Day:", day);
  const timePeriods = dayData[0];

  Object.entries(timePeriods).forEach(([timePeriod, slots]) => {
    console.log("  Time Period:", timePeriod);

    slots.forEach(({ start_time, end_time }, i) => {
      console.log(`    Slot ${i + 1}`);
      console.log("      Start Time:", start_time);
      console.log("      End Time:", end_time);
    });
  });
});