接口返回数据后，将其渲染到swiper上，但样式没发生改变

var swiper = new Swiper("#swiper1", {
    slidesPerView: 3,
    observer:true,
    observeParents:true,
    grid: {
        rows: 2,
    },
    spaceBetween: 30,
    pagination: {
        el: ".swiper-pagination",
        clickable: true,
    },
});

1. observer:true,//修改swiper自己或子元素时，自动初始化swiper

2. observeParents:true,//修改swiper的父元素时，自动初始化swiper   加上这两个属性就可以了