滚动到第二屏幕时出现的“置顶”按钮层级有问题

src/views/index.vue

@@ -287,9 +287,7 @@ export default {
         subIndex = 0,
         firstSub = [],
         secondSub = [];
-        // flag = false;
       outloop: for (let i = 0; i < list.length; i++) {
-        // if(flag) break;
         firstSub = list[i].firstSubjectModelList;
         for (let j = 0; j < firstSub.length; j++) {
           secondSub = firstSub[j].secondSubjectModelList;
@@ -298,7 +296,6 @@ export default {
               parentIndex = i;
               fIndex = j;
               subIndex = k;
-              // flag = true;
               break outloop;
             }
           }
@@ -306,7 +303,6 @@ export default {
       }
       this.currentModelIndex = parentIndex;
       this.listData = this.titleTestModelList[parentIndex].firstSubjectModelList || [];
-      console.log('查找对应的职称与专业', this.currentModelIndex, this.listData);
       this.$forceUpdate();
       this.resetProjectPosition(fIndex, subIndex);
     },
@@ -315,9 +311,7 @@ export default {
     resetProjectPosition(fIndex, subIndex) {
       this.$nextTick(() => {
         setTimeout(() => {
-          // let scrollTop = this.$refs['subject_' + subIndex].offsetTop;
           let scrollTop = document.getElementById(`subject_${fIndex}_${subIndex}`).offsetTop;
-          console.log('in resetProjectPosition', scrollTop);
           window.scrollTo(0, scrollTop - 74);
         }, 100);
       });
@@ -522,6 +516,7 @@ export default {
 }
 .back-up-icon {
   position: fixed;
+  z-index: 10;
   bottom: px2rem(50px);
   right: px2rem(15px);
   img {