SOURCE

function cTime(time,fmt) {
  var o = {
    "M+": time.getMonth() + 1,
    "d+": time.getDate(),
    "h+": time.getHours(),
    "m+": time.getMinutes(),
    "s+": time.getSeconds(),
    "q+": Math.floor((time.getMonth() + 3) / 3),
    "S": time.getMilliseconds() //毫秒
  }; 
  console.log(o);
  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (time.getFullYear() + "").substr(4 - RegExp.$1.length));
  }
  for (var k in o) {
    if (new RegExp("(" + k + ")").test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    }
  }
  return fmt;
};

console.log(cTime(new Date(1524120992 * 1000),"yyyy-MM-dd"));