swiper 不同屏幕显示不同方式

breakpoints: { 
     320: {  //当屏幕宽度大于等于320
       slidesPerView: 2,
       slidesPerGroup: 2,
       spaceBetween: 50
     },
     1000: {  //当屏幕宽度大于等于768 
       slidesPerView: 3,
       slidesPerGroup: 3,
       spaceBetween: 60
     },
     1280: {  //当屏幕宽度大于等于1280
       slidesPerView: 4,
       slidesPerGroup: 4,
       spaceBetween: 45
     }
   },