From b6cd212a772ba81aea29f9bcb067dbaab4e886a7 Mon Sep 17 00:00:00 2001
From: neverland <chenjiahan@youzan.com>
Date: Wed, 22 Sep 2021 16:16:48 +0800
Subject: [PATCH] perf(@vant/use): remove raf polyfill (#9544)

---
 packages/vant-use/src/utils.ts | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/packages/vant-use/src/utils.ts b/packages/vant-use/src/utils.ts
index 2bc2417b5..d30edf8f7 100644
--- a/packages/vant-use/src/utils.ts
+++ b/packages/vant-use/src/utils.ts
@@ -1,25 +1,13 @@
 export const inBrowser = typeof window !== 'undefined';
 
-const root = (inBrowser ? window : global) as Window;
-
-let prev = Date.now();
-
-function rafPolyfill(fn: FrameRequestCallback): number {
-  const curr = Date.now();
-  const ms = Math.max(0, 16 - (curr - prev));
-  const id = setTimeout(fn, ms);
-  prev = curr + ms;
-  return id;
-}
-
 export function raf(fn: FrameRequestCallback): number {
-  const requestAnimationFrame = root.requestAnimationFrame || rafPolyfill;
-  return requestAnimationFrame.call(root, fn);
+  return inBrowser ? requestAnimationFrame(fn) : -1;
 }
 
 export function cancelRaf(id: number) {
-  const cancelAnimationFrame = root.cancelAnimationFrame || root.clearTimeout;
-  cancelAnimationFrame.call(root, id);
+  if (inBrowser) {
+    cancelAnimationFrame(id);
+  }
 }
 
 // double raf for animation