flask 使用工程外的static文件位置

必须在构造函数里传参，不能用app["] = XXX 的方式！ 坑死了

#must set in construct fn  cant set by  app.config['static_folder'] = config.PATH_STATIC
app = Flask(__name__, static_url_path = '', static_folder=config.PATH_STATIC)
# app = Flask(__name__)
# app.config['static_folder'] = config.PATH_STATIC