关于上传图片或文件的问题，JSON的处理代码

 1 <div class="imgDIv"> 2 3 <input id="fileId" type="file" accept="application/pdf" class="imgPic"/> 4

 

 1 var formData = new FormData(); 2     var file = $("#fileId")[0].files[0]; 3     formData.append('file', file); 4     $.ajax({ 5         type:'POST', 6         url:Feng.ctxPath + "/catalog/add", 7         data:formData, 8         dataType: "formData", 9         cache: false,10         contentType: false,11         processData:false,12         mimeType:"multipart/form-data",13         success:function(data){14             if(data.code==200){15                 layer.msg("保存成功！");16                 window.parent.Catalog.table.refresh();17             }else{18                 layer.msg(data.msg)19             }20         }21     });