js顯示當前日期時間和星期幾

function showTime() {
  let show_day = new Array(
    "星期一",
    "星期二",
    "星期三",
    "星期四",
    "星期五",
    "星期六",
    "星期日"
  );
  let time = new Date();
  let year = time.getFullYear();
  let month = time.getMonth() + 1;
  let date = time.getDate();
  let day = time.getDay();
  let hour = time.getHours();
  let minutes = time.getMinutes();
  let second = time.getSeconds();
  month < 10 ? (month = "0" + month) : month;
  // month = month + 1;
  hour < 10 ? (hour = "0" + hour) : hour;
  minutes < 10 ? (minutes = "0" + minutes) : minutes;
  second < 10 ? (second = "0" + second) : second;
  let now_time =
    // "當前時間：" +
    year +
    "年" +
    month +
    "月" +
    date +
    "日" +
    " " +
    show_day[day - 1] +
    " " +
    hour +
    ":" +
    minutes +
    ":" +
    second;
  return now_time
};