swiper滑动失效问题

$.ajax({
        type: "get",
        url: "",
        dataType: "jsonp",
        success: function (json) {
            console.log(json);
            var swiper = new Swiper(‘.swiper-container‘, {
                slidesPerView: 3.5,
                spaceBetween: 0,
                freeMode: 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
            });
           
            // h5拼接字符串
            var saleItem=item.data;
            console.log(saleItem);
            if(saleItem==""||saleItem==null){
                $(".series-sale-wrap").empty();
            }
            var strSaleHtml="";
            for(var i in saleItem){
//循环的swiper-items
                strSaleHtml+=‘ <div class="swiper-slide swiper-slide-items">‘
                strSaleHtml+=‘ <div class="tb-right-items">‘
                strSaleHtml+=‘<div class="th-right-title">‘+saleItem[i].name+‘ </div>‘
                strSaleHtml+=‘<div class="sale-data">‘
                for(var j in saleItem[i].sales_data){   
                    // console.log(saleItem[i].sales_data);
                    // console.log(saleItem[i].sales_data[j]);
                    strSaleHtml +=‘<div class="sale-items">‘+saleItem[i].sales_data[j]+‘</div>‘
                    $(".sale-data").append(strSaleHtml);
                }
                strSaleHtml+=‘</div>‘;
                strSaleHtml+=‘</div>‘;
                strSaleHtml+=‘</div>‘;
            }
             $(".swiper-wrapper").append(strSaleHtml);
            
        },
        error: function () {
            console.log("请求失败");
        }

    })