vant-fork/es/utils/raf.js

Lightweight Mobile UI Components built on Vue

/**
 * requestAnimationFrame polyfill
 */
import { isServer } from './index';
var prev = Date.now();
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function fallback(fn) {
  var curr = Date.now();
  var ms = Math.max(0, 16 - (curr - prev));
  var id = setTimeout(fn, ms);
  prev = curr + ms;
  return id;
}
/* istanbul ignore next */


var root = isServer ? global : window;
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var iRaf = root.requestAnimationFrame || root.webkitRequestAnimationFrame || fallback;
/* istanbul ignore next */

var iCancel = root.cancelAnimationFrame || root.webkitCancelAnimationFrame || root.clearTimeout;
export function raf(fn) {
  return iRaf.call(root, fn);
}
export function cancel(id) {
  iCancel.call(root, id);
}