我有一个公园列表(park_list),可以按距离和面积排序。
我已经使用下面的代码成功地按距离排序:
sortList(index){
return function(a, b){
return (a[index] === b[index] ? 0 : (a[index] < b[index] ? -1 : 1));
}
}
但是,按面积排序的问题与按距离排序不同。我需要根据给定区域列表的顺序对区域进行排序(area_list)。
我的park_list是这样的:
[
{
"parkName" : "park4",
"area_id" : "4"
},
{
"parkName" : "park2",
"area_id" : "2"
},
{
"parkName" : "park1",
"area_id" : "1"
},
{
"parkName" : "park3",
"area_id" : "3"
},
]
我的area_list是这样的:
{
"cityId": "1",
"areaId": "1",
"areaName": "area1"
}, {
"cityId": "1",
"areaId": "2",
"areaName": "area2"
}, {
"cityId": "1",
"areaId": "3",
"areaName": "area3"
}, {
"cityId": "1",
"areaId": "4",
"areaName": "area4"
}
我需要根据 area_list 中 areaId 的顺序对 park_list 进行排序。
因此,如果我的 area_list 是这样的:
{
"cityId": "1",
"areaId": "2",
"areaName": "area2"
}, {
"cityId": "1",
"areaId": "4",
"areaName": "area4"
}, {
"cityId": "1",
"areaId": "1",
"areaName": "area1"
}, {
"cityId": "1",
"areaId": "3",
"areaName": "area1"
}
我的park_list应该像这样排序:
[
{
"parkName" : "park2",
"area_id" : "2"
},
{
"parkName" : "park4",
"area_id" : "4"
},
{
"parkName" : "park1",
"area_id" : "1"
},
{
"parkName" : "park3",
"area_id" : "3"
},
]
我真的很难受这个问题。我真的很感激任何形式的帮助。
最佳答案
使用Array#reduce
创建一个对象来保存每个area_id
的索引方法,然后使用该对象进行排序。
const area_list_index = area_list.reduce((obj, { areaId }, i) => {
obj[areaId] = i;
return obj;
}, {})
park_list.sort((a, b) => area_list_index[a.area_id] - area_list_index[b.area_id])
let park_list = [{
"parkName": "park4",
"area_id": "4"
},
{
"parkName": "park2",
"area_id": "2"
},
{
"parkName": "park1",
"area_id": "1"
},
{
"parkName": "park3",
"area_id": "3"
},
]
let area_list = [{
"cityId": "1",
"areaId": "2",
"areaName": "area2"
}, {
"cityId": "1",
"areaId": "4",
"areaName": "area4"
}, {
"cityId": "1",
"areaId": "1",
"areaName": "area1"
}, {
"cityId": "1",
"areaId": "3",
"areaName": "area1"
}]
const area_list_index = area_list.reduce((obj, {
areaId
}, i) => {
obj[areaId] = i;
return obj;
}, {})
park_list.sort((a, b) => area_list_index[a.area_id] - area_list_index[b.area_id])
console.log(park_list);
或者您可以使用Array#findIndex
获取索引的方法,但效率不高。
park_list.sort((a, b) => area_list.findIndex((o) => o.areaId == a.area_id) - area_list.findIndex((o) => o.areaId == b.area_id))
let park_list = [{
"parkName": "park4",
"area_id": "4"
},
{
"parkName": "park2",
"area_id": "2"
},
{
"parkName": "park1",
"area_id": "1"
},
{
"parkName": "park3",
"area_id": "3"
},
]
let area_list = [{
"cityId": "1",
"areaId": "2",
"areaName": "area2"
}, {
"cityId": "1",
"areaId": "4",
"areaName": "area4"
}, {
"cityId": "1",
"areaId": "1",
"areaName": "area1"
}, {
"cityId": "1",
"areaId": "3",
"areaName": "area1"
}]
park_list.sort((a, b) => area_list.findIndex((o) => o.areaId == a.area_id) - area_list.findIndex((o) => o.areaId == b.area_id))
console.log(park_list);
关于javascript - 如何使用另一个 json 的顺序对 json 对象进行排序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/55707520/