From 0f0a9fe6103686d8ed02500aa620b3588ed3571d Mon Sep 17 00:00:00 2001
From: anymost <creatuture@gmail.com>
Date: Mon, 15 Apr 2019 11:37:30 +0800
Subject: [PATCH] fix cannot read offset of undefined on anchor component

---
 src/components/anchor/anchor.vue | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/components/anchor/anchor.vue b/src/components/anchor/anchor.vue
index 8301307a..1e9d0437 100644
--- a/src/components/anchor/anchor.vue
+++ b/src/components/anchor/anchor.vue
@@ -168,7 +168,9 @@ export default {
                 this.handleScrollTo();
                 this.handleSetInkTop();
                 this.updateTitleOffset();
-                this.upperFirstTitle = this.scrollElement.scrollTop < this.titlesOffsetArr[0].offset;
+                if (this.titlesOffsetArr[0]) {
+                    this.upperFirstTitle = this.scrollElement.scrollTop < this.titlesOffsetArr[0].offset;
+                }
                 on(this.scrollContainer, 'scroll', this.handleScroll);
                 on(window, 'hashchange', this.handleHashChange);
             });