$.ajax({
              type : "get",url : "data.PHP",data : {type:1 },dataType:"json",beforeSend: function(){
                 $('.swiper-wrapper').html('');
	      },error:function(){
                //alert("操作出错");
              },success:function(res){


              	var html = "";
              	$.each(res['result'],function(i,item) {
              		
              		html += '<div class="swiper-slide"><a href="####"><img src="'+item.pic+'"></a></div>';
                });
              	
                $('.swiper-wrapper').html(html);


                var swiper = new Swiper('.swiper-container',{
		      	pagination: '.swiper-pagination',paginationClickable: 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
	        	onSlideChangeStart:function(sw){
	         	var num = parseInt(sw.activeIndex);
		    	console.log('---'+ num);
		    	


        		}
		    });


              }
         	});

新增两句：

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