我用ajax去获取后台数据，然后用Swiper插件去做滑动效果，不过没反应，
   要是把Swiper对象放到success里面又能有效果,如果不用ajax获取，静态写的话又能用
   这是怎么回事，还是有什么机制问题？
   
            $.ajax({
                    type: "get",
                    url: "nav.php",
                    cache: false,
                    dataType: "json",
                    success: function(data) {
                        var data = data;
                        var html = '';
                        for (var i = 0; i < data.length; i++) {
                            html += '<p class="swiper-slide">' + data[i].nav + '</p>';
                        }
                        $(".swiper-container .swiper-wrapper").get(0).innerHTML = html;
                    },
                    error: function() {
                        alert("出错");
                    }
                });
                
                var swiper2 = new Swiper('.swiper-container', {
                            slidesPerView: 7,
                            paginationClickable: true,
                            spaceBetween: 30,
                            freeMode: true
                });
                
                
            ----------html--------------    
                <p class="swiper-container">
                <p class="swiper-wrapper">
                    <!--<p class="swiper-slide">中国</p>
                    <p class="swiper-slide">中国</p>
                    <p class="swiper-slide">中国</p>
                    <p class="swiper-slide">中国</p>
                    <p class="swiper-slide">中国</p>
                    <p class="swiper-slide">中国</p>
                    <p class="swiper-slide">中国</p>
                    <p class="swiper-slide">中国</p>
                    <p class="swiper-slide">中国</p>
                    <p class="swiper-slide">中国</p>-->
                </p>
            </p>