swiper6 的监听事件onSlideChangeEnd无效

Question

VUE项目，"swiper": "^6.4.15",

import Swiper, { Pagination, Navigation } from 'swiper'
Swiper.use([Pagination, Navigation])
import 'swiper/swiper.min.css'

let mySwiper = new Swiper('.swiper-container', {

            loop: true,
            observer: true,
            onSlideChangeEnd: (swiper) => {
                alert(swiper.activeIndex) //切换结束时，告诉我现在是第几个slide
            },

})

onSlideChangeEnd无效
mySwiper的 对象属性上，也没有onSlideChangeEnd

求解