feat: 选段修改

src/helpers/formateMusic.ts

@@ -1619,7 +1619,7 @@ const parseXmlToRepeat = (repeats: any) => {
 		} else if (direction === 'backward') {
 			end = notesNumber
 			repeatInfo.push({
-				start,
+				start: start ? start : 1,
 				end
 			})
 		}