yyyy-MM-dd HH:mm:ss格式转时间戳，再转回去

export function stamp(i){
  let timestamp2 = Date.parse(new Date(i));
  timestamp2 = timestamp2 / 1000 +10;
  // console.log(i + "的时间戳为：" + timestamp2);

  var newDate = new Date();
  newDate.setTime(timestamp2 * 1000);
  Date.prototype.format = function(format) {
    var date = {
      "M+": this.getMonth() + 1,
      "d+": this.getDate(),
      "h+": this.getHours(),
      "m+": this.getMinutes(),
      "s+": this.getSeconds(),
      "q+": Math.floor((this.getMonth() + 3) / 3),
      "S+": this.getMilliseconds()
    };
    if (/(y+)/i.test(format)) {
      format = format.replace(RegExp.$1, (this.getFullYear() + '').substr(4 - RegExp.$1.length));
    }
    for (var k in date) {
      if (new RegExp("(" + k + ")").test(format)) {
        format = format.replace(RegExp.$1, RegExp.$1.length == 1
          ? date[k] : ("00" + date[k]).substr(("" + date[k]).length));
      }
    }
    return format;
  }
  return newDate.format('yyyy-MM-dd hh:mm:ss')
}