一种方式：@app.route('/article/<path:filename>')
def get_article(filename):
"""
这个函数用于处理对/article路径下文件的访问请求，
会从article目录下查找对应的html文件并返回。
"""
return send_from_directory('article', filename)
另一种方式：
配置Flaskd的静态static_folder，
app = Flask(__name__, static_folder='static')
以下是源码，不设置默认是static
def __init__(
self,
import_name: str,
static_url_path: t.Optional[str] = None,
static_folder: t.Optional[t.Union[str, os.PathLike]] = "static",
static_host: t.Optional[str] = None,
host_matching: bool = False,
subdomain_matching: bool = False,
template_folder: t.Optional[t.Union[str, os.PathLike]] = "templates",
instance_path: t.Optional[str] = None,
instance_relative_config: bool = False,
root_path: t.Optional[str] = None,
):
