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。

   function fozhuce() {
               var oUname = document.getElementById("uname");
               var oError = document.getElementById("error_box");
               var oUpass = document.getElementById("upass");
               var oUpass1 = document.getElementById("upass1");
               var isError = true;
               oError.innerHTML = "<br>";
   
               if (oUname.value.length < 6 || oUname.value.length > 20) {
                   oError.innerHTML = "用户名要6-20位";
                   isError = false;
                   return isError;
               }else if(oUname.value.charCodeAt(0)>=48 &&(oUname.value.charCodeAt(0)<=57)){
                   oError.innerHTML="首位不能为数字";
                   isError = false;
                   return isError;
               }else for (var i=0;i<oUname.value.length;i++){
                  if((oUname.value.charCodeAt(i)<48)||(oUname.value.charCodeAt(i)>57)&&(oUname.value.charCodeAt(i)<58)&&(oUname.value.charCodeAt(i)>97)){
                   oError.innerHTML="只能为数字和字母";
                   isError = false;
                   return isError;
                  }
               }if (oUpass.value.length < 6 || oUpass.value.length > 20) {
                   oError.innerHTML = "密码要6-20位";
                   isError = false;
                   return isError;
               }else if(oUpass.value!=oUpass1.value) {
                   oError.innerHTML = "设置密码和验证密码不一致";
                   isError = false;
                   return isError;
               }
               return ture;
               }

    

2. html文件：
   1. <form>中设置 action和method="post"
   2. <input> 中设置 name

      {% extends 'ba.html' %}
      {% block title %}
          欢迎哦
      {% endblock %}
      
      {% block main %}
          <link rel="stylesheet" type="text/css" href="../static/css/登录注册样式.css">
          <script src="../static/js/注册页面.js"></script>
          <form action="{{ url_for('zhuce') }}" method="post">
              <div class="box">
                  <div id="tittle"><h2 align="center">注册</h2></div>
                  <p class="input_box">
                      账户： <input id="uname" type="text" placeholder="请输入您的昵称" name="username">
                  </p>
                  <p class="input_box">
                      密码： <input id="upass" type="password" placeholder="请设置您的密码" name="password">
                  </p>
                  <p class="input_box">
                      验证： <input id="upass1" type="password" placeholder="请再次输入密码" name="password">
                  </p>
                  <p class="input_box">
                      邮箱： <input id="youxiang" type="password" placeholder="请输入您的邮箱" name="email">
                  </p>
      
                  <div id="error_box"><br></div>
                  <div class="input_button">
                      <button type="submit" onclick="return fozhuce()">立即注册</button>
                  </div>
                  <h4 align="center"><a href="denglu.html">已有账号请登录</a></h4>
              </div>
          </form>
      {% endblock %}

       

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
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()
# # 增加
# user = User(username = 'zhuyinyin',password='113428164508')
# db.session.add(user)
# db.session.commit()
# 修改
# ser=User.query.filter(User.username =='zhuyinyin').first()
# user.password='123'
# print(user.username,user.password)
# db.session.commit()
#查询：
# User.query.filter(User.username == 'zhuyinyin').first()
# print(user.username,user.password)

# db.session.commit()
# 修改：
# user.password = '111111'
# db.session.commit()

# 删除：
# db.session.delete(user)
# db.session.commit()


@app.route('/')
def hello_world():
    return render_template('ba.html')
@app.route('/zhuce/',methods=['GET','POST'])
def zhuce():
    if request.method == 'GET':
        return render_template('zhuce.html')
    else:
        username = request.form.get('username')  # 获取form中的数据
        password = request.form.get('password')  # 获取form中的数据
        # email = request.form.get('email')  # 获取form中的数据
        user = User.query.filter(User.username ==username).first()
        if user:
            return'用户已存在'
        else:
            user = User(username = username,password=password)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('denglu'))

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

@app.route('/shouye/')
def shouye():
    return render_template('春夏秋冬.html')
@app.route('/wenda/')
def wenda():
    return render_template('wenda.html')

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