获取当前时间的前一天

 // 获取当前时间的前一日
      let now = new Date();
      let oneDay = 24 * 60 * 60 * 1000; // 一天的毫秒数
      let yesterday = new Date(now.getTime() - oneDay);
      // 格式化日期
      let year = yesterday.getFullYear();
      let month = yesterday.getMonth() + 1;
      let day = yesterday.getDate();
      let yesterdayTime = year + '-' + month + '-' + day