react 修改state某一屬性值

1.state

// 篩選框相關數據
            searchSelect: { term: { value: '學期', key: '', options: [] }, type_of_personnel: { value: '教師類型', key: '', options: [] }, business_type: { value: '業務類型', key: '', options: [] },cycle_year: { value: '年', key: '', options: [] },cycle_month: { value: '月', key: '', options: [] } },

2.修改state

            let cycle_month = Object.assign({}, this.state.searchSelect.cycle_month, { key: dateString.split('-')[0] })
            let cycle_year = Object.assign({}, this.state.searchSelect.cycle_year, { key: dateString.split('-')[1] })
            let searchSelect = Object.assign({}, this.state.searchSelect, { cycle_month:cycle_month , cycle_year :cycle_year })