SOURCE

const  unit_list = [
    {
        "multi_unit_id": 107132,
        "conversion_rate": 1,
        "unit_id": 1831,
        "unit_use_type": 0,
        "unit_no": "P220614183424770",
        "unit_type": 0,
        "primary_unit": 1,
        "unit_name": "个"
    },
    {
        "multi_unit_id": 114003,
        "conversion_rate": 2,
        "unit_id": 1830,
        "unit_use_type": 2,
        "unit_no": "P220614644454671",
        "retail_price": 1,
        "unit_type": 0,
        "primary_unit": 1,
        "unit_name": "只"
    },
    {
        "multi_unit_id": 107117,
        "conversion_rate": 2,
        "unit_id": 1832,
        "unit_use_type": 1,
        "unit_no": "P220614297589925",
        "unit_type": 0,
        "primary_unit": 0,
        "unit_name": "双"
    },
    {
        "multi_unit_id": 116001,
        "conversion_rate": 1,
        "unit_id": 1831,
        "unit_use_type": 1,
        "unit_no": "P220614183424770",
        "unit_type": 0,
        "primary_unit": 1,
        "unit_name": "个"
    },
    {
        "multi_unit_id": 107120,
        "conversion_rate": 1,
        "unit_id": 1831,
        "unit_use_type": 2,
        "unit_no": "P220614183424770",
        "retail_price": 2,
        "unit_type": 0,
        "primary_unit": 0,
        "unit_name": "个"
    }
]

// 首先排除unit_use_type !== 2的数据
const arr = unit_list.filter(unit=> unit.unit_use_type !== 2)
 function formatArr (arr, key) {
        let obj = {}
        let newArr = arr.reduce((prev, cur) => {
            obj[cur[key]] ? '' : obj[cur[key]] = true && prev.push(cur)
            return prev
        }, [])
        return newArr
    }