class Moment{
  constructor(time){
    this.time=time
  }
  change(){
    let date=new Date(this.time);
    let nowtime=new Date();
    let newtime=nowtime-date;
    let year=Math.floor(newtime/1000/60/60/24/365),
    month=Math.floor(newtime/1000/60/60/24/30%12),
    day=Math.floor(newtime/1000/60/60/24%30);
    console.log(day)
    return year+'年'+month+'月'+day+'天'
  }
}
console.log(new Moment("2020-3-19").change())