在 @ app.route('index.html')处创建另一条路线，渲染 index.html 模板，请确保 index.html 文件位于模板文件夹中

create another route at @app.route('index.html') rendering index.html the template, make sure the index.html file is in the templates folder

像这样:

@app.route('/index.html')
def index():
    return render_template('index.html')

资源需要从flask的 templates文件夹或 static文件夹提供，您没有资源，可以自动将其提供令人难以置信的是不安全，因为任何用户都可以通过简单地更改链接来访问整个服务器.

resources need to be served from either the templates folder or the static folder in flask, you can't have a resource and have it automatically served as that would be incredibly insecure, since any user then will have access to your entire server by simply changing the link.