layui实现多图上传，支持拖拽上传

<div class="layui-upload">
      <div class="layui-upload-drag"id="test2">
             <i class="layui-icon">�</i>
             <p>点击多图上传，或将文件拖拽到此处</p>
      </div>
                  
      <blockquote class="layui-elem-quote layui-quote-nm"style="margin-top: 10px;">预览图：
            <div class="layui-upload-list"id="demo2"></div>
      </blockquote>
    <p id="tipTxt"></p>
</div>

layui.use(['element', 'layer','form','upload'], function(){
        var $ =layui.jquery
        ,layer =layui.layer
        ,element =layui.element
        ,upload =layui.upload
        ,form =layui.from;
        //多图片上传
upload.render({
        elem: '#test2',url: 'xxx.xxx' //改成您自己的上传接口
        ,multiple: true,accept:'images',exts:'jpg|jpeg|png|gjf|webp|bmp|tif',drag:true,allDone: function(obj){ 
          var txt = "共选择了 【"+obj.total+"】 张图片，其中，上传成功 【"+obj.successful+"】 张，失败 <span style='color:red'>【"+obj.aborted+"】 </span>张";
          $("#tipTxt").html(txt);
        }
        ,before: function(obj){
          //预读本地文件示例，不支持ie8
          obj.preview(function(index, file, result){
            $('#demo2').append('<img src="https://tool.4xseo.com/article/97471.html'+ result +'" alt="'+ file.name +'" class="layui-upload-img">')
          });
          
        }
        ,done: function(res){
          $('#demoText').html('');
          //上传完毕
          if (res.code == 200) {
            layer.msg('上传完毕', {icon: 1});
          }
        }
      });

    });