Question

我有一个对象数组，我想首先按日期排序，然后按其数值排序。

let arr = [  
  {date: 2018-06-19 12:05:43.232Z, value: 3},
  {date: 2018-06-20 12:05:43.232Z, value: 4},  
  {date: 2018-06-18 12:05:43.232Z, value: 2},  
  {date: 2018-06-20 12:05:43.232Z, value: 4}, 
  {date: 2018-06-19 12:05:43.232Z, value: 5},     
  {date: 2018-06-18 12:05:43.232Z, value: 5},  
  {date: 2018-06-20 12:05:43.232Z, value: 5},  
  {date: 2018-06-19 12:05:43.232Z, value: 4},  
]

我想按日期和值对每个索引进行排序，这样结果将是：

let arr = [
  {date: 2018-06-18 12:05:43.232Z, value: 2},
  {date: 2018-06-18 12:05:43.232Z, value: 5},

  {date: 2018-06-19 12:05:43.232Z, value: 3},
  {date: 2018-06-19 12:05:43.232Z, value: 4},
  {date: 2018-06-19 12:05:43.232Z, value: 5}, 

  {date: 2018-06-20 12:05:43.232Z, value: 3},
  {date: 2018-06-20 12:05:43.232Z, value: 4},     
  {date: 2018-06-20 12:05:43.232Z, value: 5},     
]

怎么办？

Answer 1

您可以将Array.sort与||一起使用

const res = arr.sort((a, b) => Date.parse(a.date) - Date.parse(b.date) || a.value - b.value);
console.log(res);

<script>
let arr = [{
    date: '2018-06-19 12:05:43.232Z',
    value: 3
  },
  {
    date: '2018-06-20 12:05:43.232Z',
    value: 4
  },
  {
    date: '2018-06-18 12:05:43.232Z',
    value: 2
  },
  {
    date: '2018-06-20 12:05:43.232Z',
    value: 4
  },
  {
    date: '2018-06-19 12:05:43.232Z',
    value: 5
  },
  {
    date: '2018-06-18 12:05:43.232Z',
    value: 5
  },
  {
    date: '2018-06-20 12:05:43.232Z',
    value: 5
  },
  {
    date: '2018-06-19 12:05:43.232Z',
    value: 4
  },
]
</script>

Answer 2

您可以使用lodash库执行此操作。如果您查看orderBy函数的文档，您会发现它正是您所需要的。

let arr = [  
  {"date": "2018-06-19 12:05:43.232Z", "value": 3},
  {"date": "2018-06-20 12:05:43.232Z", "value": 4},  
  {"date": "2018-06-18 12:05:43.232Z", "value": 2},  
  {"date": "2018-06-20 12:05:43.232Z", "value": 4}, 
  {"date": "2018-06-19 12:05:43.232Z", "value": 5},     
  {"date": "2018-06-18 12:05:43.232Z", "value": 5},  
  {"date": "2018-06-20 12:05:43.232Z", "value": 5},  
  {"date": "2018-06-19 12:05:43.232Z", "value": 4}  
]

在阵列上应用_orderBy，如下所示：

_.orderBy(arr, ['date', 'value'], ['asc', 'asc']);

将为您提供所需的结果。

检查以下示例：

let arr = [  
  {"date": "2018-06-19 12:05:43.232Z", "value": 3},
  {"date": "2018-06-20 12:05:43.232Z", "value": 4},  
  {"date": "2018-06-18 12:05:43.232Z", "value": 2},  
  {"date": "2018-06-20 12:05:43.232Z", "value": 4}, 
  {"date": "2018-06-19 12:05:43.232Z", "value": 5},     
  {"date": "2018-06-18 12:05:43.232Z", "value": 5},  
  {"date": "2018-06-20 12:05:43.232Z", "value": 5},  
  {"date": "2018-06-19 12:05:43.232Z", "value": 4}  
]



console.log(_.orderBy(arr, ['date', 'value'], ['asc', 'asc']))

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.js"></script>

如何按两个字段对数组排序（包括日期）

2 个答案: