完成注册功能

• js文件： onclick函数return True时才提交表单，return False时不提交表单。
• html文件：
  1. <form>中设置 action和method="post"
  2. <input> 中设置 name
• 主py文件中：
  1. from flask import  request, redirect, url_for
  2. @app.route('/regist/', methods=['GET', 'POST’])

def regist():

   if request.method == 'GET':

        return render_template('regist.html')

   else:

        username = request.form.get(‘username’)#获取form中的数据

        判断用户名是否存在:存在报错

  不存在，存到数据库中

       redirect重定向到登录页

 

 

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):
    __tablename__='user'
    id=db.Column(db.Integer,primary_key=True,autioncrement=True)
    username=db.Column(db.String(20),nullable=False)
    password = db.Column(db.String(20), nullable=False)
    nickname=db.Column(db.String(20))


db.create_all()

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


@app.route('/denglu/',methods=['GEI','POST'])
def login():
    return render_template("denglu.html")


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


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

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