fix 已做的题

pages2/class/detail.vue

@@ -402,7 +402,7 @@ export default {
 			}
 			this.postAnswer()
 		},
-		postStudyRecord(status=0,sectionId=self.playSectionId) {
+		postStudyRecord(status=0,sectionId=this.playSectionId) {
 			let currentTime = 0
 			 var polyvPlayerContext = this.selectComponent('#playerVideo');
 			 if(polyvPlayerContext){