vue 将后台返回的对象数组根据某个字段组成新的对象数组？

vue 如何将后台返回的对象数组根据某个字段组成新的对象数组，这也是我在最近项目中遇到的问题，特此整理一下，方便自己后期学习，也希望对需要的小伙伴提供帮助。

假如后台返回给我们如下数据结构：

var list = [
    {
        "id": 1,
        "modes": "CHARTBAR_1",
    },
    {
        "id": 2,
        "modes": "CHARTBAR_1",
    },
    {
        "id": 3,
        "modes": "CHARTBAR_2",
    },
    {
        "id": 4,
        "modes": "CHARTBAR_2",
    },
    {
        "id": 5,
        "modes": "CHARTBAR_3",
    },
    {
        "id": 6,
        "modes": "CHARTBAR_4",
    },
    {
        "id": 7,
        "modes": "CHARTBAR_4",
    },
    {
        "id": 8,
        "modes": "CHARTBAR_1",
    },
    {
        "id": 9,
        "modes": "CHARTBAR_1",
    },
    {
        "id": 10,
        "modes": "CHARTBAR_1",
    },
]

然后，我们要让上面的数据根据 modes 字段重新组合成新的对象数组，比如整合成下面这样：

[{
    "modes": "CHARTBAR_1",
    "list": [{
        "id": 1,
	"modes": "CHARTBAR_1"
    }, {
	"id": 2,
	"modes": "CHARTBAR_1"
    }, {
	"id": 8,
	"modes": "CHARTBAR_1"
    }, {
	"id": 9,
	"modes": "CHARTBAR_1"
    }, {
	"id": 10,
	"modes": "CHARTBAR_1"
    }]
}, {
    "modes": "CHARTBAR_2",
    "list": [{
	"id": 3,
	"modes": "CHARTBAR_2"
    }, {
	"id": 4,
	"modes": "CHARTBAR_2"
    }]
}, {
    "modes": "CHARTBAR_3",
    "list": [{
	"id": 5,
	"modes": "CHARTBAR_3"
    }]
}, {
    "modes": "CHARTBAR_4",
    "list": [{
	"id": 6,
	"modes": "CHARTBAR_4"
    }, {
	"id": 7,
	"modes": "CHARTBAR_4"
    }]
}]

实现方法：

function getListGroupBy(list, key) {
    var keysArr = list.map(item=>item[key])
    var keys = [...new Set(keysArr)]
    var newList = keys.map(item=> {
        return {
            [key]: item,
            list: list.filter(i=>i[key] == item)
        }
    })
    return newList
}

var newList = getListGroupBy(list, 'modes')
console.log(newList)

就是这么简单！