var nowDate = ''
var weekDay = ''
var nowTime = ''
function getTime() {
      const date = new Date();
      const Y = date.getFullYear();
      const M = date.getMonth() + 1;
      const D = date.getDate();
      const MM = M < 10 ? '0' + M : M;
      const DD = D < 10 ? '0' + D : D;
      const arr = ['日', '一', '二', '三', '四', '五', '六'];
      nowDate = Y + '-' + MM + '-' + DD;
      weekDay = '星期' + arr[date.getDay()];
      const h = date.getHours();
      const m = date.getMinutes();
      const s = date.getSeconds();
      const hh = h < 10 ? '0' + h : h;
      const mm = m < 10 ? '0' + m : m;
      const ss = s < 10 ? '0' + s : s;
      nowTime = hh + ':' + mm + ':' + ss;
    }
getTime()
console.log('nowDate', nowDate) //  2023-10-1
console.log('weekDay', weekDay) //  星期日
console.log('nowTime', nowTime) //  11:15:01

獲取今天-明天-后天

addDayCount 參數(shù)：
0代表當(dāng)天的日期 以0為中心點(diǎn)
1就是明天以此類推
-1就是昨天以此類推

breaking分割符：比如 - / ** 等

export function getDateStr(addDayCount, breaking) {
    const day = new Date();
    day.setDate(day.getDate() + addDayCount);
    const y = day.getFullYear();
    const m = day.getMonth() + 1;
    const d = day.getDate();
    const mm = m < 10 ? '0' + m : m;
    const dd = d < 10 ? '0' + d : d;
    return y + breaking + mm + breaking + dd;
}