swiper移动端上左右滑动不了

var swiper = new Swiper('.swiper-container', {
    mode: 'horizontal',
    pagination: '.swiper-pagination',
    loop: true,
    observer: true,//修改swiper自己或子元素时，自动初始化swiper
    observeParents: true//修改swiper的父元素时，自动初始化swiper
});