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Layui's upload component usage and upload blocking

Background: There is a button on the page. Click to pop up the upload box. Start writing the method code of the button: handle unselected files to prevent uploading; display or hide uploads by judging the number of selected files. Button;

is defined in js:

function  uploadFile(){
    layer.open({
        type:1,
        title:'上传文件‘,
        area:['25%','400px'],
        content:&#39;<div class="layui-form-item" style="margin-top:40px;">\
          <div class="layui-input-block">\
            <input class="layui-btn" type="button" id="chooseFIle" value="选择文件">\
            <span></span>\
          </div>\
        </div>\
          <div class="layui-form-item" style="margin-top:40px;">\
          <div class="layui-input-block">\
            <input class="layui-btn" type="button" id="uploadbtn" value="上传">\
            <span></span>\
          </div>\
        </div>‘,
    btn:[&#39;关闭&#39;],
    btn1:function(idx,ele){
        layer.closeAll();
      }
  })
createUpload();
}
 
var  files ;
function createUpload(){
      $("#uploadbtn").hide();
      $("#chooseFile").next().next("span").text("");
      layui.use([&#39;upload&#39;],function(){
        var uploadInst = upload.render({
            elem:&#39;#chooseFile&#39;,
             url:&#39; &#39;,
              accept:&#39;file&#39;,
             auto:false,
            multiple:true,
          acceptMime:&#39;application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet&#39;,
          exts:&#39;xls|xlsx&#39;,
          size:1024000,
          number:5,
          bindAction:&#39;#uploadbtn&#39;,
          choose:function(obj){
            files = this.files = boj.pushFile();
            if(Object.keys(files).length>0){ $("#uploadbtn").show(); }
            obj.preview(function(index,file,result){
              $("#chooseFile").siblings("span").append("<div title=&#39;"+index+"&#39;>"+file.name+"  <span onclick=&#39;deletefile(\""+index+"\")&#39;>&times;</span></div>")
               if(index>0) {$("#uploadbtn").show() ;}
              })
          },
        allDone:function(obj){  
            if(obj.successful){
              layer.msg(obj.total+"个文件上传成功!");
            }
          },
        error:function(){
          layer.alert("上传成功!");
        }
    })
  }
}
function  deletefile(index){
  delete  files[index];
  $("#chooseFile").siblings("span").find("div[title="+index+"]").remove();
  if(!Object.keys(files).length>0){
      $("#uploadbtn").hide();
  }
 
}

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