if(file.response!=undefined){

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

@@ -191,18 +191,18 @@ class NewWorkForm extends Component{
   }
   
   onAttachmentRemove = (file, stateName) => {
-    this.props.confirm({
-      content: '是否确认删除?',
-      
-      onOk: () => {
-        this.deleteAttachment(file, stateName)
-      },
-      onCancel() {
-        console.log('Cancel');
-      },
-    });
-
-    
+ 		if(file.response!=undefined){
+      this.props.confirm({
+        content: '是否确认删除?',
+        
+        onOk: () => {
+          this.deleteAttachment(file, stateName)
+        },
+        onCancel() {
+          console.log('Cancel');
+        },
+      });
+    }
     return false;
   }
   deleteAttachment = (file, stateName) => {