flask框架bootstrap引用不当

flask框架bootstrap引用不当,运行结果无反应

hello.py

from flask import Flask, render_template
from flask_bootstrap import Bootstrap

app = Flask(__name__)

bootstrap = Bootstrap(app)


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


@app.route('/user/')
def user(name):
    return render_template('user.html', name=name)

user.html

{% extends 'bootstrap/base.html'%}

{% block title %}Flasky{% endblock %}

{% block navbar %}
<div class="navbar navbar-inverse" role="navigation">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                <span class="sr-only">Toggle navigationspan>
                <span class="icon-bar">span>
                <span class="icon-bar">span>
                <span class="icon-bar">span>
            button>
            <a class="navbar-brand" href="/">Flaskya>
        div>
        <div class="navbar-collapse collapse">
            <ul class="nav navbar-nav">
                <li><a href="/">Homea>li>
            ul>
        div>
    div>
div>
{% endblock %}

{% block content %}
<div class="container">
    <div class="page-header">
        <h1>Hello, {{ name }}!h1>
    div>
div>
{% endblock %}

index.html

<h1>helloword!h1>

原因找到了，没有启动服务器