1.用上下文处理器app_context_processor定义函数
- 获取session中保存的值
- 返回字典
2.在父模板中更新导航，插入登录状态判断代码。
- 注意用{% ... %}表示指令。
- {{ }}表示变量
3.完成注销功能。
- 清除session
- 跳转
base.html
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>基础模块</title> {% block title %} {% endblock %} <link rel="stylesheet" href="{{ url_for('static',filename='css/base.css')}}"> <script src="{{ url_for('static',filename='js/base.js') }}"></script> <base target="_blank" /> {% block head %} {% endblock %} <base href="http://i1.sinaimg.cn/dy/weather/main/index14/007/icons_32_yl/"target="_blank"> </head> <body id="myBody"> <div class="clearfloat"> <nav > <img src="w_02_08_00.png" > <a href="{{ url_for('index') }}" >首页</a> <a href="">下载</a> <a href="">图书馆</a> <a href="">意见反馈</a> <a href="{{ url_for('question') }}">发布问答</a> <input type="text" name="search"> <button type="submit">搜索</button> <a href="" >联系我们</a> {% if username %} <a class="right" href="#">{{ username }}</a> <a href="{{ url_for('logout') }}">注销</a> {% else %} <a class="right" href="{{ url_for('login') }}">登录</a> <a href="{{ url_for('zhuce') }}">注册</a> {% endif %} <img id="myOnOff" onclick="mySwitch()" src="http://www.runoob.com/images/pic_bulbon.gif" width="20px";> </nav><hr> </div> <br> <br> <br> <br><br> <h1> 广州商学院欢迎你! </h1> <br><br> <h1> 活力广商，筑梦远航！ </h1> <br><br><br> <div id="footer" style="background-color: lightskyblue;clear: both;text-align: center;"></div> <div class="desc" > <hr> <div class="img" > <a href="http://www.gzcc.cn/"> <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508497686486&di=e2ccca98fa05f9473c84f73db141ad88&imgtype=0&src=http%3A%2F%2Fpic1.win4000.com%2Fwallpaper%2F7%2F57ac36088f69c.jpg" width="20px"> </a> <div><a href="http://www.gzcc.cn/">数字广商</a></div> </div> <div class="img"> <a href="http://www.gzcc.cn/"> <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508497686476&di=50b7102b085d85e015eff1b2d31436ea&imgtype=0&src=http%3A%2F%2Fimg5.xiazaizhijia.com%2Fwalls%2F20150803%2F1440x900_96ae2cb132cbe37.jpg"></a> <div><a href="http://www.gzcc.cn/">视频校园</a></div> </div> <div class="img" class="clearfloat" class="img-hover"> <a href="http://www.gzcc.cn/"> <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508498137537&di=82dbcda3618e2dfd61810d2fb0daf202&imgtype=0&src=http%3A%2F%2Fpic1.win4000.com%2Fwallpaper%2F1%2F5754d121da01d.jpg"></a> <div><a href="http://www.gzcc.cn/">画说校园</a></div> </div> <div class="img"> <a href="http://www.gzcc.cn/"> <img src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1508498264263&di=55e6cb21f27b29f83d3c9ff9a73b3bae&imgtype=0&src=http%3A%2F%2Fwww.zcool.com.cn%2Fcommunity%2F037b9a359147e96b5b3086ed42c6bee.jpg" width="80px"></a> <div><a href="http://www.gzcc.cn/">全景校园</a></div> </div> </div> <footer> <div class="footer_box"> Copyright © 2017 广州商学院 All Rights Reserved 版权归本学校所有 </div> </footer> {% block main %} {% endblock %} </body> </html>
py
from flask import Flask,render_template,request,redirect,url_for,session from flask_sqlalchemy import SQLAlchemy import config 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() @app.route('/') def index(): return render_template('index.html') @app.route('/zhuce/',methods=['GET','POST']) def zhuce(): if request.method =='GET': return render_template('zhuce.html') else: usern = request.form.get('name') teln = request.form.get('password') passw = request.form.get('password1') user = User.query.filter(User.username==usern).first() if user: return 'username existed' else: user= User(username=usern,tel=teln,password=passw) 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.context_processor def mycontext(): usern = session.get('user') if usern: return{'username':usern} else: return {} @app.route('/logout') def logout(): session.clear() return redirect(url_for('index')) @app.route('/question/',methods=['GET','POST']) def question(): return render_template('question.html') if __name__ == '__main__': app.run(debug=True)