我正在通过观看一些视频教程来学习烧瓶。我有一个app.py文件，我在其中呈现login.html，这是base.html的扩展。我不知道为什么，但我的表单不知怎么没有出现在网页上。
**app.py-**
from flask import Flask , redirect , url_for , render_template , request , flash
app = Flask(__name__)
@app.route("/")
def home():
return render_template("index.html" )
@app.route("/login", methods=["GET","POST"])
def login():
return render_template("login.html")
@app.route("/<usr>")
def user(usr):
return f"<h1> {usr} </h1>"
if __name__ == "__main__":
app.run(debug=True)
**login.html-**
{% extends "base.html" %}
{% block title %} Login Page {% endblock %}
{% block content %}
<form action= "#" method ="post">
<p>Name:</p>
<p><input type = "text" name = "nm" /></p>
<p><input type = "submit" value = "submit" /></p>
</form>
{% endblock %}
这是我的base.html文件。正如我之前所说，我没有得到任何错误，只是一张空白页。base.html
<!DOCTYPE html>
<html lang="en">
<head>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css"
integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title{% block title%}{% endblock%}</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
</ul>
</div>
</nav>
<h1>My website</h1>
{% block content %}
{% endblock %}
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>
请检查login.html文件路径，因为它需要在同一应用程序文件夹中。然后，只需在login.html中添加如下简单代码：
<html>
<head>
</head>
<body>Test login page</body>
</html>
检查日志/浏览器中出现的错误。
您确信，您编写了localhost:/登录
或者写curl-X POST localhost:/登录您的终端/cmd
如果这对你没有帮助，告诉我你什么时候看到错误的！