diff --git a/src/components/BackToTop/index.vue b/src/components/BackToTop/index.vue
index cbb1f21d..de953821 100644
--- a/src/components/BackToTop/index.vue
+++ b/src/components/BackToTop/index.vue
@@ -25,14 +25,16 @@ export default {
     },
     customStyle: {
       type: Object,
-      default: {
-        right: '50px',
-        bottom: '50px',
-        width: '40px',
-        height: '40px',
-        'border-radius': '4px',
-        'line-height': '45px',
-        background: '#e7eaf1'
+      default: function() {
+        return {
+          right: '50px',
+          bottom: '50px',
+          width: '40px',
+          height: '40px',
+          'border-radius': '4px',
+          'line-height': '45px',
+          background: '#e7eaf1'
+        }
       }
     },
     transitionName: {