完成注册功能

1. js文件： onclick函数return True时才提交表单，return False时不提交表单。
2. html文件：
   1. <form>中设置 action和method="post"
   2. <input> 中设置 name

       <div class="box">
              <h1>注册</h1>
              <form action="{{ url_for('zhuce') }}" method="post">
                  <div class="input_box">
                      <input id="name" type="text" placeholder="请输入用户名" name="username">
                  </div>
                  <div class="input_box">
                      <input id="phone" type="text" placeholder="昵称" name="userphone" name="nickname">
                  </div>
                  <div class="input_box">
                      <input id="phone" type="text" placeholder="手机号" name="userphone">
                  </div>
                  <div class="input_box">
                      <input id="pass" type="password" placeholder="请输入密码" name="password">
                  </div>
                  <div class="input_box">
                      <input id="passcom" type="password" placeholder="请再次输入密码">
                  </div>
                  <div id="error_box"><br>
                  </div>
                  <div class="input_box">
                      <button onclick="fnLogin()">注册</button>
                  </div>
              </form>
      
          </div>

       

3. 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, autoincrement=True)
    username = db.Column(db.String(20), nullable=False)
    password = db.Column(db.String(20), nullable=False)

db.create_all()

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