swiperRef.value?.slidePrev is not a function

解决方法

需要在swiper标签中添加 @swiper=“onSwiper”

const onSwiper = (swiper) => {
  swiperRef.value = swiper;
};

再调用slidePrev方法就正常了

const doNavigation = (type) => {
  if (type === "prev") {
    swiperRef.value?.slidePrev();
  } else {
    swiperRef.value?.slideNext();
  }
};