SOURCE

function fillZero(str) {
  var realNum;
  if (str < 10) {
    realNum = "0" + str;
  } else {
    realNum = str;
  }
  return realNum;
}
 function getNowTime() {
  let now = new Date();
  let year = now.getFullYear(); //获取完整的年份(4位,1970-????)
  let month = now.getMonth() + 1; //获取当前月份(0-11,0代表1月)
  let today = now.getDate(); //获取当前日(1-31)
  let hour = now.getHours(); //获取当前小时数(0-23)
  let minute = now.getMinutes(); //获取当前分钟数(0-59)
  let second = now.getSeconds(); //获取当前秒数(0-59)
  let nowTime = "";
  nowTime =
    year +
    "-" +
    fillZero(month) +
    "-" +
    fillZero(today) +
    " " +
    fillZero(hour) +
    ":" +
    fillZero(minute) +
    ":" +
    fillZero(second);
  return nowTime;
}
console.log(getNowTime())