SOURCE

const setAnimationFrameInterval = (cb, time) => {
    let currentTime = 0
    let lastTime = Date.now()
    const timerId = {}
    function animloop() {
        //记录当前时间
        currentTime = Date.now();
        if (currentTime - lastTime > time) {
            lastTime = currentTime
            cb();
        }
        //timerid为数字
        timerId.id = requestAnimationFrame(animloop);
    }
    animloop()
    return timerId;
}

const clearAnimationFrame = (id) => {
    cancelAnimationFrame(id)
}
let count = 0
let timer = setAnimationFrameInterval(() => {
    console.log(111)
    count++
    if(count > 4) {
        console.log(timer)
        
    }
}, 1000)

setTimeout(() => {clearAnimationFrame(timer.id)}, 5000)



// 后台requestAni 不执行  配合setTimeout