增加返回顶部

@@ -15,7 +15,8 @@ class NewHome extends Page {
             $userAvatar: $('.user-avatar'),
             $codeSet: $('.code-set'),
             $resYas: $('.res-c').find('a'),
-            $trendCode: $('.trend-code')
+            $trendCode: $('.trend-code'),
+            $floatTop: $('.float-top')
         };
 
         this.init();
@@ -27,9 +28,20 @@ class NewHome extends Page {
         this.swiper();
         this.showTrend();
         this.autoScroll();
+        this.backToTop();
         window.reMarginFooter('.footer-tab');
     }
 
+    backToTop() {
+        $(document).scroll(() => {
+            if (($(document).scrollTop() >= 120)) {
+                this.selector.$floatTop.addClass('hover');
+            } else {
+                this.selector.$floatTop.removeClass('hover');
+            }
+        });
+    }
+
     autoScroll() {
         new AutoScroll(
             {