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perf(@vant/use): remove raf polyfill (#9544)

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neverland 2021-09-22 16:16:48 +08:00 committed by GitHub
parent 38b1be3ac2
commit b6cd212a77
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1 changed files with 4 additions and 16 deletions
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packages/vant-use/src/utils.ts
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@ -1,25 +1,13 @@
export const inBrowser = typeof window !== 'undefined'; 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 { export function raf(fn: FrameRequestCallback): number {
const requestAnimationFrame = root.requestAnimationFrame || rafPolyfill; return inBrowser ? requestAnimationFrame(fn) : -1;
return requestAnimationFrame.call(root, fn);
} }
export function cancelRaf(id: number) { export function cancelRaf(id: number) {
const cancelAnimationFrame = root.cancelAnimationFrame || root.clearTimeout; if (inBrowser) {
cancelAnimationFrame.call(root, id); cancelAnimationFrame(id);
}
} }
// double raf for animation // double raf for animation