flask登录注册页面

好的，下面是一个简单的 Flask 登录注册页面的示例代码，包括了表单提交、数据验证、密码加密等功能：

from flask import Flask, render_template, request, redirect, url_for, flash
from flask_sqlalchemy import SQLAlchemy
from werkzeug.security import generate_password_hash, check_password_hash

app = Flask(__name__)
app.config['SECRET_KEY'] = 'your_secret_key_here'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'
db = SQLAlchemy(app)

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(50), unique=True, nullable=False)
    password = db.Column(db.String(100), nullable=False)

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

@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        confirm_password = request.form['confirm_password']

        if not username or not password or not confirm_password:
            flash('Please fill in all the fields.')
            return redirect(url_for('register'))

        if password != confirm_password:
            flash('Passwords do not match.')
            return redirect(url_for('register'))

        if User.query.filter_by(username=username).first():
            flash('Username already exists.')
            return redirect(url_for('register'))

        hashed_password = generate_password_hash(password)
        new_user = User(username=username, password=hashed_password)
        db.session.add(new_user)
        db.session.commit()

        flash('You have successfully registered.')
        return redirect(url_for('login'))

    return render_template('register.html')

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']

        if not username or not password:
            flash('Please fill in all the fields.')
            return redirect(url_for('login'))

        user = User.query.filter_by(username=username).first()

        if not user or not check_password_hash(user.password, password):
            flash('Username or password is incorrect.')
            return redirect(url_for('login'))

        flash('You have successfully logged in.')
        return redirect(url_for('index'))

    return render_template('login.html')

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

其中，`index.html`、`register.html` 和 `login.html` 分别是主页、注册页面和登录页面的 HTML 模板文件，可以根据自己的需要进行修改。同时，需要注意引入的 Flask 扩展包和模块，以及数据库模型的定义和数据库的初始化等细节问题。