时间中间键的整理

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
 name: 'interval'
})
export class IntervalPipe implements PipeTransform {

 transform(value: any): any {
  let date = new Date(value)
  if (!date) {
   return ''
  }
  let now = new Date()
  let year = now.getFullYear() - date.getFullYear()
  if (year) {
   return year + '年前'
  }
  let month = now.getMonth() - date.getMonth()
  if (month) {
   return month + '月前'
  }
  let day = now.getDate() - date.getDate()
  if (day) {
   return day + '天前'
  }
  let hour = now.getHours() - date.getHours()
  if (hour) {
   return hour + '小时前'
  }
  let min = now.getMinutes() - date.getMinutes()
  if (min) {
   return min + '分钟前'
  }

  return '刚刚';
 }

}