登录功能完成：
- js:设置return
- html:设置
- form
- input
-
onclick="return fnLogin()"
- py:
- @app.route设置methods
- GET
- POST
- 读取表单数据
- 查询数据库
- 用户名密码对：
- 记住用户名
- 跳转到首页
- 用户名密码不对：
- 提示相应错误。
- 用户名密码对：
session：
- 从`flask`中导入`session`
- 设置`SECRET_KEY`
- 操作字典一样操作`session`：增加用户名`session['username']=`username
config.py:
import os SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@127.0.0.1:3306/dianying?charset=utf8' SQLALCHEMY_TRACK_MODIFICATIONS = False SECRET_KEY = os.urandom(24)
主py文件：
from flask import Flask,request,render_template,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): __tablename__='user' id = db.Column(db.Integer,primary_key=TabError,autoincrement=True) username = db.Column(db.String(20),nullable=False) password = db.Column(db.String(20), nullable=False) #db.create_all() # #增加 # user = User(username='123456',password = '456789') # db.session.add(user) # db.session.commit() # # #查询 # user =User.query.filter(User.username =='abcdef').first() # print(user.username,user.password) # # #修改 # user =User.query.filter(User.username =='123456').first() # user.password='abcdef' # print(user.username,user.password) # db.session.commit() # # #删除 # user =User.query.filter(User.username =='123456').first() # print(user.username,user.password) # db.session.delete(user) # db.session.commit() @app.route('/') def dh(): return render_template('dh.html') @app.route('/sy/') def sy(): return render_template('sy.html') @app.route('/dl/',methods=['GET','POST']) def dl(): if request.method == 'GET': return render_template("dl.html") else: usern = request.form.get('name') password = request.form.get('password') user = User.query.filter(User.username == usern).first() if user: if user.password == password: session['user'] = usern return redirect(url_for('sy')) else: return '密码错误(〃＞皿＜)' else: return '用户不存在┌(。Д。)┐' @app.route('/zc/',methods=['GET','POST']) def zc(): if request.method == 'GET': return render_template("zc.html") else: usern = request.form.get('name') password = request.form.get('password') user = User.query.filter(User.username == usern).first() if user: return '用户名已存在┗|*｀0′*|┛ ' else: user1 = User(username=usern, password=password) db.session.add(user1) db.session.commit() return redirect(url_for('dl')) @app.route('/fk/') def fk(): return render_template('fk.html') if __name__ == '__main__': app.run(debug=True)
登录HTML：
{% extends 'dh.html' %} {% block title %} 登录 {% endblock %} {% block main %} <link rel="stylesheet" type="text/css" href="../static/css/dl.css"> <script src="../static/js/dl.js"></script> </head> <body> <div class="box" > <form action="{{url_for('dl')}}" method="post"> <div class="container" style=" 400px"align="center"> <div class="dl" style="background-color:#c8a4fa;400px"><h2 align="center" style="margin-bottom: 0;400px">✉登 录✉</h2></div> <div class="content" style="background-color:lightpink;height:205px;400px;float:left;"> <div class="xx" align="center"> <p> </p> 账 户：<input id="name" type="text"placeholder="请输入用户名" name="name"><br> 密 码：<input id="password" type="password"placeholder="请输入密码" name="password"> <p> </p> </div> <div id="error_box"><br></div> <p> </p> <div class="an" > <button onclick="myLogin()">登录</button> <button type="button" onclick=window.alert("是否取消登录！")>取消</button> </div> </div> </div> </form> </div> </body> </html> {% endblock %}
