30秒学会 JavaScript 片段 – recordAnimationFrames

Invokes the provided callback on each animation frame.

Use recursion.
Provided that running is true, continue invoking window.requestAnimationFrame() which invokes the provided callback.
Return an object with two methods start and stop to allow manual control of the recording.
Omit the second argument, autoStart, to implicitly call start when the function is invoked.

代码片段

const recordAnimationFrames = (callback, autoStart = true) => {
  let running = true,
    raf;
  const stop = () => {
    running = false;
    cancelAnimationFrame(raf);
  };
  const start = () => {
    running = true;
    run();
  };
  const run = () => {
    raf = requestAnimationFrame(() => {
      callback();
      if (running) run();
    });
  };
  if (autoStart) start();
  return { start, stop };
};

使用样例

const cb = () => console.log('Animation frame fired');
const recorder = recordAnimationFrames(cb); // logs 'Animation frame fired' on each animation frame
recorder.stop(); // stops logging
recorder.start(); // starts again
const recorder2 = recordAnimationFrames(cb, false); // `start` needs to be explicitly called to begin recording frames