写一个 vue hook 实现函数缓存

function useMemo(fn, deps) {
    let prevDeps = useRef([]);
    let hasChanged = deps.some((d, i) => !Object.is(d, prevDeps.current[i]));

    if (hasChanged) {
        fn.current = fn();
        prevDeps.current = deps;
    }
    return fn.current;
}