如何从 JSON 中的月份列表中选择当前月份？

Posted 2023-02-16

【中文标题】如何从 JSON 中的月份列表中选择当前月份？

【英文标题】：How to select current month from list of month in JSON in react native?

【发布时间】：2021-12-27 06:40:45

【问题描述】：

我有一个 JSON 格式的月份列表，想从 react native 的列表中选择当前月份

这是我的清单

Month: [
          value: "1", label: "JAN", key: "JAN" ,
          value: "2", label: "FEB", key: "FEB" ,
          value: "3", label: "MAR", key: "MAR" ,
          value: "4", label: "APRIL", key: "APRIL" ,
          value: "5", label: "MAY", key: "MAY" ,
          value: "6", label: "JUN", key: "JUN" ,
          value: "7", label: "JUL", key: "JUL" ,
          value: "8", label: "AUG", key: "AUG" ,
          value: "9", label: "SEP", key: "SEP" ,
          value: "10", label: "OCT", key: "OCT" ,
          value: "11", label: "NOV", key: "NOV" ,
          value: "12", label: "DEC", key: "DEC" 
       ]

【问题讨论】：

您应该添加您自己尝试过的内容。查看：***.com/help/how-to-ask 了解如何提出好问题。

【参考方案1】：

这样做会为您提供数组中的当前月份：

let Month = [
   value: "1", label: "JAN", key: "JAN" ,
   value: "2", label: "FEB", key: "FEB" ,
   value: "3", label: "MAR", key: "MAR" ,
   value: "4", label: "APRIL", key: "APRIL" ,
   value: "5", label: "MAY", key: "MAY" ,
   value: "6", label: "JUN", key: "JUN" ,
   value: "7", label: "JUL", key: "JUL" ,
   value: "8", label: "AUG", key: "AUG" ,
   value: "9", label: "SEP", key: "SEP" ,
   value: "10", label: "OCT", key: "OCT" ,
   value: "11", label: "NOV", key: "NOV" ,
   value: "12", label: "DEC", key: "DEC" 
];

let currentMonth = Month[new Date().getMonth()];
console.log(currentMonth);

【参考方案2】：

您可以使用

找到当前月份索引

const currentMonthIndex = new Date().getMonth() + 1

月份通常从 0 开始，所以你必须加 1 然后就可以通过数组进行过滤了

const selectedMonth = months.find(m => m.value === currentMonthIndex)