console.log(JSON.stringify(this.data.date_list));

    this.data.date_list[0].datetime_list.push({

        startTime: '01:00',

        endTime: '02:00'

    })

    console.log(JSON.stringify(this.data.date_list));

第一行输出结果：[{"date":"02.08","week":"周六","value":"2025-02-08","datetime_list":[]},{"date":"02.09","week":"周日","value":"2025-02-09","datetime_list":[]},{"date":"02.10","week":"周一","value":"2025-02-10","datetime_list":[]},{"date":"02.11","week":"周二","value":"2025-02-11","datetime_list":[]},{"date":"02.12","week":"周三","value":"2025-02-12","datetime_list":[]},{"date":"02.13","week":"周四","value":"2025-02-13","datetime_list":[]},{"date":"02.14","week":"周五","value":"2025-02-14","datetime_list":[]},{"date":"02.15","week":"周六","value":"2025-02-15","datetime_list":[]},{"date":"02.16","week":"周日","value":"2025-02-16","datetime_list":[]},{"date":"02.17","week":"周一","value":"2025-02-17","datetime_list":[]},{"date":"02.18","week":"周二","value":"2025-02-18","datetime_list":[]},{"date":"02.19","week":"周三","value":"2025-02-19","datetime_list":[]},{"date":"02.20","week":"周四","value":"2025-02-20","datetime_list":[]},{"date":"02.21","week":"周五","value":"2025-02-21","datetime_list":[]},{"date":"02.22","week":"周六","value":"2025-02-22","datetime_list":[]},{"date":"02.23","week":"周日","value":"2025-02-23","datetime_list":[]},{"date":"02.24","week":"周一","value":"2025-02-24","datetime_list":[]},{"date":"02.25","week":"周二","value":"2025-02-25","datetime_list":[]},{"date":"02.26","week":"周三","value":"2025-02-26","datetime_list":[]},{"date":"02.27","week":"周四","value":"2025-02-27","datetime_list":[]},{"date":"02.28","week":"周五","value":"2025-02-28","datetime_list":[]},{"date":"03.01","week":"周六","value":"2025-03-01","datetime_list":[]},{"date":"03.02","week":"周日","value":"2025-03-02","datetime_list":[]},{"date":"03.03","week":"周一","value":"2025-03-03","datetime_list":[]},{"date":"03.04","week":"周二","value":"2025-03-04","datetime_list":[]},{"date":"03.05","week":"周三","value":"2025-03-05","datetime_list":[]},{"date":"03.06","week":"周四","value":"2025-03-06","datetime_list":[]},{"date":"03.07","week":"周五","value":"2025-03-07","datetime_list":[]},{"date":"03.08","week":"周六","value":"2025-03-08","datetime_list":[]},{"date":"03.09","week":"周日","value":"2025-03-09","datetime_list":[]}]

第二行输出结果：[{"date":"02.08","week":"周六","value":"2025-02-08","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.09","week":"周日","value":"2025-02-09","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.10","week":"周一","value":"2025-02-10","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.11","week":"周二","value":"2025-02-11","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.12","week":"周三","value":"2025-02-12","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.13","week":"周四","value":"2025-02-13","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.14","week":"周五","value":"2025-02-14","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.15","week":"周六","value":"2025-02-15","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.16","week":"周日","value":"2025-02-16","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.17","week":"周一","value":"2025-02-17","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.18","week":"周二","value":"2025-02-18","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.19","week":"周三","value":"2025-02-19","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.20","week":"周四","value":"2025-02-20","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.21","week":"周五","value":"2025-02-21","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.22","week":"周六","value":"2025-02-22","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.23","week":"周日","value":"2025-02-23","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.24","week":"周一","value":"2025-02-24","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.25","week":"周二","value":"2025-02-25","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.26","week":"周三","value":"2025-02-26","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.27","week":"周四","value":"2025-02-27","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"02.28","week":"周五","value":"2025-02-28","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"03.01","week":"周六","value":"2025-03-01","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"03.02","week":"周日","value":"2025-03-02","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"03.03","week":"周一","value":"2025-03-03","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"03.04","week":"周二","value":"2025-03-04","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"03.05","week":"周三","value":"2025-03-05","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"03.06","week":"周四","value":"2025-03-06","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"03.07","week":"周五","value":"2025-03-07","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"03.08","week":"周六","value":"2025-03-08","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]},{"date":"03.09","week":"周日","value":"2025-03-09","datetime_list":[{"startTime":"01:00","endTime":"02:00"}]}]