goBack

@@ -23,7 +23,7 @@ class GradeDetailPage extends Page {
 
         this.eGradeGraph = echarts.init(this.view.gradeGraph[0]);
         this.eGradeGraph.on('click', this.monthDetailInit.bind(this));
-        this.view.navBack.on('click', this.back.bind(this));
+        this.view.navBack.on('click', this.goBack.bind(this));
 
         this.beforeScroll = document.body.scrollTop;
         this.year = 0;