日期格式化

function parseTime(time, cFormat) {
  if (arguments.length === 0) {
    return null
  }
  const format = cFormat || \'{y}-{m}-{d} {h}:{i}:{s}\'
  let date
  if (typeof time === \'object\') {
    date = time
  } else {
    if ((typeof time === \'string\') && (/^[0-9]+$/.test(time))) {
      time = parseInt(time)
    }
    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(),
    a: date.getDay()
  }
  const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key]
    // Note: getDay() returns 0 on Sunday
    if (key === \'a\') { return [\'日\', \'一\', \'二\', \'三\', \'四\', \'五\', \'六\'][value ] }
    if (result.length > 0 && value < 10) {
      value = \'0\' + value
    };
    return value || 0
  });
  return time_str
};
parseTime(\'1576028118956\',\'{m}月{d}日 {h}:{i}:{s}\')

格式化：

parseTime(\'1576028118956\',\'{m}月{d}日 {h}:{i}:{s}\')

parseTime(\'2018-12-11\',\'{y}-{m}-{d} {h}:{i}:{s}\')