adui/lib/_util/raf.js

<div> <img src="https://wxa.wxs.qq.com/mpweb/delivery/legacy/wxadtouch/upload/t1/od834zef_52939fc6.png" style="margin:40px 0 0 -8px; background-color: #fcfcfc; box-shadow: none;" /> </div>

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getRequestAnimationFrame = getRequestAnimationFrame;

function requestAnimationFramePolyfill() {
  var lastTime = 0;
  return function (callback) {
    var currTime = new Date().getTime();
    var timeToCall = Math.max(0, 16 - (currTime - lastTime));
    var id = window.setTimeout(function () {
      callback(currTime + timeToCall);
    }, timeToCall);
    lastTime = currTime + timeToCall;
    return id;
  };
}

function getRequestAnimationFrame() {
  if (typeof window === "undefined") {
    return function () {};
  }

  var _window = window,
      requestAnimationFrame = _window.requestAnimationFrame;

  if (requestAnimationFrame) {
    return requestAnimationFrame;
  }

  return requestAnimationFramePolyfill();
}
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