使用requestAnimationFrame设置定时器

    function rafSetTimeout(callback,timer) {
        let handle = {id:0}
        const start = Date.now();
        const loop = ()  => {
            const current = Date.now();
            if(current-start > timer){
                callback();
            }else{
                handle.id = requestAnimationFrame(loop);
            }
        }
        handle.id = requestAnimationFrame(loop);
        return handle;
    }

    function rafInterval(callback,timer) {
        let handle = {id:0}
        let start = Date.now();
        const loop = ()  => {
            const current = Date.now();
            if(current-start > timer){
                callback();
                start = Date.now();
            }
            handle.id = requestAnimationFrame(loop);
        }
        handle.id = requestAnimationFrame(loop);
        return handle;
    }