// 日期格式化
export function parseTime(time, pattern) {
  if (arguments.length === 0 || !time) {
    return null;
  }
  const format = pattern || "{y}-{m}-{d} {h}:{i}:{s} 星期{w}";
  let date;
  if (typeof time === "object") {
    date = time;
  } else {
    if (typeof time === "string" && /^[0-9]+$/.test(time)) {
      time = parseInt(time);
    } else if (typeof time === "string") {
      time = time.replace(new RegExp(/-/gm), "/");
    }
    if (typeof time === "number" && time.toString().length === 10) {
      time = time * 1000;
    }
    date = new Date(time);
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    w: date.getDay()
  };
  const time_str = format.replace(/{(y|m|d|h|i|s|w)+}/g, (result, key) => {
    let value = formatObj[key];
    // Note: getDay() returns 0 on Sunday
    if (key === "w") {
      return ["日", "一", "二", "三", "四", "五", "六"][value];
    }
    if (result.length > 0 && value < 10) {
      value = "0" + value;
    }
    return value || 0;
  });
  return time_str;
}

示例：

parseTime(new Date())
// 2022-10-08 16:44:08 星期六

parseTime(new Date(),'{y}-{m}-{d}')
// 2022-10-08