fix: bug

src/pages/course/study.vue

@@ -806,6 +806,10 @@
 		//#ifdef APP-PLUS
 		uni.offKeyboardHeightChange(setHeight)
 		// #endif
+		try {
+			teacherVoiceObj?.stop()
+			teacherVoiceObj.src = ''
+		} catch {}
 		// common.show('提示信息', '检测到您已离开，即将退出学习页面。',false, '','确认').then((res) => {
 		// 	common.redirectTo(`/pages/courseDetail/index?crsId=${crsId.value}&crsNum=${crsNum.value}&from=study`)
 		// }).finally(() => {})