import functools

def logtime(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        start = time.perf_counter()
        res = func(*args, **kwargs)
        end = time.perf_counter()
        print(f'函数 {func.__name__} 耗时 {(end - start) * 1000} ms')
        return res
    return wrapper