js处理日期格式yyyy-MM-dd hh：mm：ss

直接上代码：

使用方法：

dateformat(\'h:m:s\') => 09:08:11

dateformat(\'y-M-d h:m:s\') => 2018-06-08 09:08:11

/**
 * params:{
 * \'y, 年
 * M, 月
 * d, 日
 * h, 时
 * m, 分
 * s\' 秒
 * }
 * 使用方法：dateformat(\'h:m:s\') => 09:08:11
 * dateformat(\'y-M-d h:m:s\') => 2018-06-08 09:08:11
 */
export function dateformat(params) {
  var date = new Date(),
  year = date.getFullYear(),
  month = date.getMonth() + 1,
  day = date.getDate(),
  hour = date.getHours(),
  minute = date.getMinutes(),
  second = date.getSeconds()

  var arr = params.split(\'\')
  var result = \'\'
  for(var i = 0; i < arr.length; i += 2){
    var tem = arr[i+1] === undefined ? \'\' : arr[i+1]
    switch(arr[i]){
      case \'y\': result += addZero(year) + tem
      break
      case \'M\': result += addZero(month) + tem
      break
      case \'d\': result += addZero(day) + tem
      break
      case \'h\': result += addZero(hour) + tem
      break
      case \'m\': result += addZero(minute) + tem
      break
      case \'s\': result += addZero(second)
      break
    }
  }
  return result
}

// 如果时间是个位数，就补0
function addZero(obj){
  return obj < 10 ? \'0\' + obj : obj
}