单张二维码不现实左右按钮

 let $ = require('yoho-jquery');
 let Swiper = require('yoho-swiper');
 let mySwiper;
+let $swiperSlide = $('.swiper-wrapper .swiper-slide');
+let $chanBtn = $('.qrcode-wrap .chan');
 
 mySwiper = new Swiper('.swiper-container', {
     onSlideChangeStart: function(swiper) {
         $('.pagec').html(swiper.snapIndex + 1);
     }
 });
+
+if ($swiperSlide.length <= 1) {
+    $chanBtn.hide();
+}
+
 $('.prev').click(function() {
     mySwiper.slidePrev();
 });