From 8d60697ec193232461217f3102c2ac95e79f8c14 Mon Sep 17 00:00:00 2001
From: neverland <chenjiahan@youzan.com>
Date: Tue, 28 Dec 2021 11:46:48 +0800
Subject: [PATCH] perf: caching handlers of useRefs (#10108)

---
 packages/vant/src/composables/use-refs.ts | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/packages/vant/src/composables/use-refs.ts b/packages/vant/src/composables/use-refs.ts
index caf6e43d2..6fb8e4f58 100644
--- a/packages/vant/src/composables/use-refs.ts
+++ b/packages/vant/src/composables/use-refs.ts
@@ -2,13 +2,19 @@ import { ref, Ref, onBeforeUpdate } from 'vue';
 
 export function useRefs<T = Element>() {
   const refs = ref([]) as Ref<T[]>;
+  const cache: Array<(el: unknown) => void> = [];
 
   onBeforeUpdate(() => {
     refs.value = [];
   });
 
-  const setRefs = (index: number) => (el: unknown) => {
-    refs.value[index] = el as T;
+  const setRefs = (index: number) => {
+    if (!cache[index]) {
+      cache[index] = (el: unknown) => {
+        refs.value[index] = el as T;
+      };
+    }
+    return cache[index];
   };
 
   return [refs, setRefs] as const;