制作首页的显示列表。

1. 在首页添加显示问答的列表，并定义好相应的样式。

无序列表

<ul >

  <li>Coffee</li>

  <li>Tea</li>

  <li>Milk</li>

</ul>

2. 用字典向index.html传递参数。

from flask import Flask,render_template,request,redirect,url_for,session
from flask_sqlalchemy import SQLAlchemy
import config
from functools import wraps
from  datetime import datetime

app = Flask(__name__)
app.config.from_object(config)
db=SQLAlchemy(app)

class User(db.Model):
    __table__name = 'user'
    id = db.Column(db.Integer,primary_key=True,autoincrement=True)
    username = db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20),nullable=False)
    nickname = db.Column(db.String(50))
db.create_all()

class Question(db.Model):
    __tablename__ = 'question'
    id = db.Column(db.Integer, primary_key=True, autoincrement=True)
    title = db.Column(db.String(100), nullable=False)
    detail = db.Column(db.Text, nullable=False)
    creat_time = db.Column(db.DateTime, default=datetime.now)
    author_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    author = db.relationship('User', backref=db.backref('question'))

db.create_all()


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

@app.route('/index/')
def index():
    context = {
            'question':'哈哈哈'
        }
    return render_template('index.html',**context)

@app.route('/regist/',methods=['GET','POST'])
def regist():
    if request.method=='GET':
        return render_template('regist.html')
    else:
        username=request.form.get('username')
        password=request.form.get('password')
        nickname=request.form.get('nickname')
        user=User.query.filter(User.username==username).first()
        if user:
            return u'username existed'
        else:
            user=User (username=username,password=password,nickname=nickname)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('login'))



@app.route('/login/',methods=['GET','POST'])
def login():
    if request.method=='GET':
        return render_template('login.html')
    else:
        username=request.form.get('username')
        password=request.form.get('password')
        user = User.query.filter(User.username == username).first()
        if user:
            if user.password==password:
                session['user']=username
                return redirect(url_for('index'))
            else:
                return u'password error'
        else:
            return u'username is not existed'


@app.route('/logout/')
def logout():
    session.clear()
    return redirect(url_for('index'))


def loginFirst(func):
    @wraps(func)
    def wrapper(*args, ** kwargs):
        if session.get('user'):
            return func(*args, ** kwargs)
        else:
            return redirect(url_for('login'))
    return  wrapper


@app.route('/question/',methods=['GET','POST'])
@loginFirst
def question():
    if request.method=='GET':
        return render_template('question.html')
    else:
        title = request.form.get('title')
        detail = request.form.get('detail')
        author_id = User.query.filter(User.username == session.get('user')).first().id
        question = Question(title=title, detail=detail, author_id=author_id)
        db.session.add(question)
        db.session.commit()
        return redirect(url_for('index'))



@app.context_processor
def mycontext():
    usern=session.get('user')
    if usern:
        return{'username':usern}
    else:
        return{}


if __name__ == '__main__':
    app.run(debug=True)

{% extends 'base.html' %}

{% block title %}首页{% endblock %}

{% block head %}
    <link href="{{ url_for('static',filename='css/index.css') }}" rel="stylesheet" type="text/css">
    <script src="{{ url_for('static',filename='js/index.js') }}"></script>
{% endblock %}

{% block main %}
<p>{{ username }}contextx</p>
    <ul class="list-group"style="">
            <li class="list-group-item">
                <span class="glyphicon glyphicon-leaf"aria-hidden="true"></span>
                <a href="#">username</a>
                <br>
                <a href="*">title</a>
                <span class="badge">creat_time</span>
                <p style="">detail{{ question }}</p>
            </li>

    </ul>




<body background="http://f10.baidu.com/it/u=4181379019,968220141&fm=72"></body>

{% endblock %}