addEventListener、removeEventList

mounted () {
    window.addEventListener('scroll', this.lazyLoad)
},
destroyed() {
    window.removeEventListener('scroll', this.lazyLoad)
},
methods: {
      lazyLoad() {
        if (window.scrollY === 500 && this.month.send) {
          this.getMonthList()
        }
        if (window.scrollY === 1000 && this.late3Month.send) {
          this.getLate3MonthList()
        }
      },
}