《Flask-web开发》第四章案例html页面显示不出来

Question

以下为书中代码，但是我在本地浏览器运行时，网页是空白。是html没有渲染出来么？这是什么原因？

from flask import Flask,render_template
from flask_bootstrap import Bootstrap
from flask_wtf import Form
from wtforms import StringField,SubmitField
from wtforms.validators import Required

app=Flask(__name__)
app.config['SECRET_KEY']='hard to guess string'
bootstrap=Bootstrap(app)

class NameForm(Form):
    name=StringField('W',validators=[Required()])
    submit=SubmitField('Submit')

@app.route('/adddd',methods=['GET','POST'])
def index():
    name=None
    form=NameForm()
    if form.validate_on_submit():
        name=form.name.data
        form.name.data=''
    return render_template('index.html',form=form,name=name)    
    
if __name__=='__main__':
    app.run(debug=True,host='127.0.0.1', port=80)
    
index.html    
{% extends "base.html" %}
{% import "bootstrap/wtf.html" as wtf %}

{% block title %}Flasky{% endblock %}
{% block page_content %}
<div class="page-header">
        <h1>Hello,{% if name %}{{ name }}{% else %}Stranger{% endif %}</h1>
</div>
{{ wtf.quick_form(form) }}
{% endblock %}

Answer 1

看看你的base.html里面，有没有{% block page_content %}这个block