export function  getPrevious8Weeks(currentDate) {
    // 确保传入的是Date对象
    const date = new Date(currentDate);
    
    // 获取当前日期是星期几（0-6，0代表周日）
    const currentDay = date.getDay();
    
    // 计算当前周的周一（将周日作为一周的最后一天）
    const mondayOffset = currentDay === 0 ? -6 : 1 - currentDay;
    const currentMonday = new Date(date);
    currentMonday.setDate(date.getDate() + mondayOffset);
    
    const result = [];
    
    // 生成前8个自然周的日期范围（从上一周开始，不包含当前周）
    for (let i = 1; i <= 8; i++) {
      const weekStart = new Date(currentMonday);
      weekStart.setDate(currentMonday.getDate() - i * 7);
      
      const weekEnd = new Date(weekStart);
      weekEnd.setDate(weekStart.getDate() + 6);
      
      // 格式化日期为 YYYY-MM-DD
      const startStr = formatDate(weekStart);
      const endStr = formatDate(weekEnd);
      
      result.push([startStr, endStr]);
    }
    
    return result;
  }
  
  // 辅助函数：格式化日期为 YYYY-MM-DD
  function formatDate(date) {
    const year = date.getFullYear();
    const month = String(date.getMonth() + 1).padStart(2, '0');
    const day = String(date.getDate()).padStart(2, '0');
    return `${year}-${month}-${day}`;
  }