fix

src/pages/websiteindex/index.js

@@ -357,7 +357,7 @@ Page({
     let that = this
     let scrollTop = e.scrollTop;
     if(that.data.websiteCourses && that.data.websiteCourses.switch==1){
-      if (scrollTop >= 800) {
+      if (scrollTop >= 300) {
         // 当页面顶端距离大于一定高度时
         this.setData({
           fixBtnShow: true

src/pages/websiteindex/onlineclassroomplay.js

@@ -1180,8 +1180,8 @@ audioStorage[value].isWaiting = true;
   prevContentImg (e) {
     const {dataset} = e.currentTarget;
     const current = dataset.src;
-    console.log(current,'当前');
-    let type = current.indexOf('pdf')!=-1 ? 'media': '';
+    // 4ppt/  5pdf
+    let type = (this.data.coursesDetail.content.type==4 || this.data.coursesDetail.content.type==5) ? 'media': '';
     const images = this.data.coursesDetail.content.images;
     wxPreviewImage({
       urls: images,