在Typescript中按日期变量将数组元素分组为周

// 假设数组为data，包含日期字符串的元素
const data = ["2022-01-01", "2022-01-02", "2022-01-03", "2022-01-04", "2022-01-05", "2022-01-06", "2022-01-07"];

// 存储每个周对应的数组元素
const weeklyGroups: { [week: string]: string[] } = {};

data.forEach((dateString) => {
  const date = new Date(dateString);
  const week = `Week ${getWeekNumber(date)}`; // 获取周数
  if (!weeklyGroups[week]) {
    weeklyGroups[week] = [];
  }
  weeklyGroups[week].push(dateString);
});

// 输出结果
console.log(weeklyGroups);

// 获取日期对应的周数
function getWeekNumber(date: Date): number {
  const firstDayOfYear = new Date(date.getFullYear(), 0, 1);
  const dayOfYear = Math.floor((date.getTime() - firstDayOfYear.getTime()) / (24 * 60 * 60 * 1000));
  return Math.ceil((date.getDay() + 1 + dayOfYear) / 7);
}