Merge remote-tracking branch 'origin/gray'

 {
   "name": "yohobuywap-node",
-  "version": "6.5.40",
+  "version": "6.5.41",
   "private": true,
   "description": "A New Yohobuy Project With Express",
   "repository": {

@@ -44,8 +44,9 @@ class GradeDetailPage extends Page {
 
         this.eGradeGraph = echarts.init(this.view.gradeGraph[0]);
 
+        this.view.navBack.on('click', this.goBack.bind(this));
+
         // this.eGradeGraph.on('click', this.monthDetailInit.bind(this));
-        // this.view.navBack.on('click', this.goBack.bind(this));
         // this.eGradeGraph.on('dataZoom', this.dataZoomEvent.bind(this));
 
         this.beforeScroll = document.body.scrollTop;