Function createAnimationFrame

front/components/u-charts/u-charts.js:4033–4048

()

  var delay = 17;

  function createAnimationFrame() {
    if (typeof setTimeout !== 'undefined') {
      return function(step, delay) {
        setTimeout(function() {
          var timeStamp = +new Date();
          step(timeStamp);
        }, delay);
      };
    } else if (typeof requestAnimationFrame !== 'undefined') {
      return requestAnimationFrame;
    } else {
      return function(step) {
        step(null);
      };
    }
  };
  var animationFrame = createAnimationFrame();
  var startTimeStamp = null;
  var _step = function step(timestamp) {