改成根据为你优选位置判断回到顶部按钮

@@ -16,7 +16,8 @@ class NewHome extends Page {
             $codeSet: $('.code-set'),
             $resYas: $('.res-c').find('a'),
             $trendCode: $('.trend-code'),
-            $floatTop: $('.float-top')
+            $floatTop: $('.float-top'),
+            $recommendC: $('#new-recommend-c')
         };
 
         this.init();
@@ -33,13 +34,17 @@ class NewHome extends Page {
     }
 
     backToTop() {
-        $(document).scroll(() => {
-            if (($(document).scrollTop() >= 120)) {
-                this.selector.$floatTop.addClass('hover');
-            } else {
-                this.selector.$floatTop.removeClass('hover');
-            }
-        });
+        if (this.selector.$recommendC.length > 0) {
+            $(document).scroll(() => {
+                let recommendTop = this.selector.$recommendC.offset().top - $(document).scrollTop();
+
+                if (recommendTop <= 400) {
+                    this.selector.$floatTop.addClass('hover');
+                } else {
+                    this.selector.$floatTop.removeClass('hover');
+                }
+            });
+        }
     }
 
     autoScroll() {

@@ -43,7 +43,7 @@ class NewRecommend extends Page {
                     this.selector.$goodsContainer.append($goodsData);
                     lazyLoad($goodsData.find('img.lazy'));
                 } else {
-                    this.selector.$recommendC.hide();
+                    this.selector.$recommendC.remove();
                 }
             }
         }).catch(error => {