if(file.response!=undefined){

public/react/src/modules/courses/busyWork/NewWorkForm.js

@@ -191,6 +191,7 @@ class NewWorkForm extends Component{
   }
   
   onAttachmentRemove = (file, stateName) => {
+ 		if(file.response!=undefined){
       this.props.confirm({
         content: '是否确认删除?',
         
@@ -201,8 +202,7 @@ class NewWorkForm extends Component{
           console.log('Cancel');
         },
       });
-
-    
+    }
     return false;
   }
   deleteAttachment = (file, stateName) => {