js date formatting encapsulation method

Date format yyyy-mm-dd h:i:s format

usage:

let date=parseTime(new Data())

js method:

//第二个参数可传可不传
export function parseTime(time, pattern) {
    
    
  if (arguments.length === 0 || !time) {
    
    
    return null
  }
  const format = pattern || '{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)
    } else if (typeof time === 'string') {
    
    
      time = time.replace(new RegExp(/-/gm), '/').replace('T', ' ').replace(new RegExp(/\.[\d]{
    
    3}/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(),
    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