如何根據reactjs中日期的降序排序對象數組？

Question

我有一個如下所示的對象數組，並希望按降序排序。

下面是對象數組

[
{
    "attributes": {

    },
    "timestamp": "2019-04-03T21:00:00+00:00",
},
{
    "attributes": {
    },
    "timestamp": "2019-04-03T09:24:27.179190+00:00",
},
{
    "attributes": {
    },
    "timestamp": "2019-04-03T08:54:06.721557+00:00",
},
{
    "attributes": {

    },
    "timestamp": "2019-04-03T04:54:56.227415+00:00",
},
]

我試過了什么？

 let sorted_array = this.state.array.sort((a, b) => a.timestamp - 
     b.timestamp);
 this.setState({array: sorted_array});

但這不起作用。 你能幫我一個人嗎？

Answer 1

更換

(a, b) => a.timestamp - b.timestamp

同

(a, b) => a.timestamp.valueOf() - b.timestamp.valueOf()

（如果timestamp確實是Date對象的話。）

Answer 2

您可以創建每個時間戳的日期對象並進行比較

 const data = [ { "attributes": {}, "timestamp": "2019-04-03T21:00:00+00:00", }, { "attributes": {}, "timestamp": "2019-04-03T09:24:27.179190+00:00", }, { "attributes": {}, "timestamp": "2019-04-03T08:54:06.721557+00:00", }, { "attributes": {}, "timestamp": "2019-04-03T04:54:56.227415+00:00", }, ] console.log(data.sort((a, b) => new Date(a.timestamp) - new Date(b.timestamp))); 

Answer 3

由於timestamps是針對詞典排序規范化的，也許你可以在sort方法上使用String.localeCompare（） ：

 let input = [ { "attributes": {}, "timestamp": "2019-04-03T21:00:00+00:00", }, { "attributes": {}, "timestamp": "2019-04-03T09:24:27.179190+00:00", }, { "attributes": {}, "timestamp": "2019-04-03T08:54:06.721557+00:00", }, { "attributes": {}, "timestamp": "2019-04-03T04:54:56.227415+00:00", } ]; input.sort((a, b) => b.timestamp.localeCompare(a.timestamp)); console.log(input); 

 .as-console {background-color:black !important; color:lime;} .as-console-wrapper {max-height:100% !important; top:0;} 

如果您需要按升序排序，請使用：

input.sort((a, b) => a.timestamp.localeCompare(b.timestamp));