浏览器的帧率功能

Question

这是我写的帧速率计数器。使用requestAnimationFrame是多余的还是重要的？

重写此函数以不使用requestAnimationFrame会产生类似的输出。

const now = performance.now.bind(performance);
const raf = window.requestAnimationFrame;
const log = console.log.bind(console);
const ONE_SECOND = 1000;
let count = 0;
let start = now();

const go = 
    raf.bind(window, ()=> {
        if (now() - start >= ONE_SECOND) {
            log('FPS: ' + count);
            count = 0;
            start = now();
            return setTimeout(go, 0);
        }

        count++;
        setTimeout(go, 0);
    });

go(); // 61, 60, 59, 60, 59...

修改

根据评论，这是一个经过修改的实施：

const raf = window.requestAnimationFrame;
const log = console.log.bind(console);
const ONE_SECOND = 1000;
let count = 0;
let start = performance.now();

const go = 
    raf.bind(window, (now)=> {
        if (now - start >= ONE_SECOND) {
            log('FPS: ' + count);
            count = 0;
            start = now;
            return go();
        }

        count++;
        go();
    });

go();