有个不必现错误，预览初步完成

core_form/frmupload/frmupload.h

@@ -70,6 +70,9 @@ private:
     // 0 md 1 url
     CopyType copyType = COPY_TYPE_MARKDOWN;
 
+signals:
+    void signal_uploadSuccess(QString url);
+
 private:
     Ui::FrmUpload *ui;
 };