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'; }}