JavaScript按日期拆分字符串并在数组中分组

// 输入的日期字符串
const dateString = "2022-08-01,2022-08-02,2022-08-03,2022-09-01,2022-09-02,2022-09-03";

// 将字符串按逗号分割成数组
const dateArray = dateString.split(",");

// 创建一个空对象用于存储分组后的结果
const groupedDates = {};

// 遍历日期数组
dateArray.forEach(dateString => {
  // 将日期字符串转换为Date对象
  const date = new Date(dateString);

  // 获取年、月、日信息
  const year = date.getFullYear();
  const month = date.getMonth() + 1;
  const day = date.getDate();

  // 构建日期字符串
  const formattedDate = `${year}-${month < 10 ? '0' + month : month}-${day < 10 ? '0' + day : day}`;

  // 将日期字符串添加到对应的分组中
  if (groupedDates[formattedDate]) {
    groupedDates[formattedDate].push(dateString);
  } else {
    groupedDates[formattedDate] = [dateString];
  }
});

// 打印分组后的结果
console.log(groupedDates);

{
  "2022-08-01": ["2022-08-01"],
  "2022-08-02": ["2022-08-02"],
  "2022-08-03": ["2022-08-03"],
  "2022-09-01": ["2022-09-01"],
  "2022-09-02": ["2022-09-02"],
  "2022-09-03": ["2022-09-03"]
}