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
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

function fnLogin() {
var oUname = document.getElementById("uname");
var oError = document.getElementById("error-box");
var oUpass = document.getElementById("upass");
var oUpass1 = document.getElementById("upass1");
var isoError = true;
oError.innerHTML = "<br>";

if (oUname.value.length<6||oUname.value.length>20){
oError.innerHTML="用户名要6-20位";
isoError = false;
return isoError;
}
else if(oUname.value.charCodeAt(0)>=48&&(oUname.value.charCodeAt(0)<=57)){
oError.innerHTML = "用户名首字母必须是字母";
isoError = false;
return isoError;
} 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)<97||oUname.value.charCodeAt(i)>122)){
oError.innerHTML = "用户名必须为字母或数字";
return isoError;
}
}

if (oUpass.value.length<6||oUpass.value.length>20){
oError.innerHTML="密码至少6-20位";
isoError = false;
return isoError;
}
if (oUpass.value!= oUpass1.value) {
oError.innerHTML = "两次密码输入不一致"
isoError = false;
return isoError;
}
window.alert("注册成功")
return true;
}

{% extends 'base.html' %}
    {% block registtitle %}注册{% endblock %}
    {% block registhead %}
    <script src="../static/js/regist.js"></script>
    {% endblock %}
{% block registbody %}
<div class="bigbox">
<div class="box">
    <h1>注册</h1>
    <form action="{{ url_for('regist') }}" method="post"></form>
    <div class="input-box">
        用户账号：<input id="uname" type="text" placeholder="请输入用户名"name="usename">
    </div>
    <div class="input-box">
        注册密码：<input id="upass" type="password" placeholder="请输入密码"name="password">
    </div>
    <div class="input-box">
        确认密码：<input id="upass1" type="password" placeholder="请再次输入密码">
    </div>
    <div id="error-box"><br></div>
    <div class="input-box">
        <button onclick="fnLogin()">确认注册</button>
    </div>
    </div>
</div>
{% endblock %}

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)

#创建表格
db.create_all()

#数据的添加方法
#user=User(username='kobe24',password='666666')
#db.session.add(user)
#db.session.commit()

#数据的查询方法
#user=User.query.filter(User.username =='kobe24').first()
#print(user.username,user.password)

# 数据的修改方法
#user = User.query.filter(User.username=='kobe24').first
#user.password='123456'
#db.session.commit()

# 数据的删除方法
#user = User.query.filter(User.username=='kobe24').first()
#db.session.delete(user)
#db.session.commit()

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

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

@app.route('/regist',methods=['GET','POST'])
def regist():
    if request.method == 'GET':
        return render_template('regist.html')
    else:
        username = request.form.get('username')
        password = request.form.get('password')
        user = User.query.filter(User.username == username).first()
        # 判断用户名是否存在
        if user:
            return u'username existed'
        else:
            user = User(username=username, password=password)
            db.session.add(user)
            db.session.commit()
            return redirect(url_for('login'))

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

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