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

1 function fnLogin() {
 2     var oUname = document.getElementById("uname");
 3     var oError = document.getElementById("error_box");
 4     var oUpass = document.getElementById("upass");
 5     var oUpass1 = document.getElementById("upass1");
 6     var isError=true;
 7     oError.innerHTML="<br>";
 8 
 9     if(oUname.value.length<6 || oUname.value.length >20){
10         oError.innerHTML="用户名6-20";
11         isError=false;
12         return isError;
13     }else if ((oUname.value.charCodeAt(0)>=48) && (oUname.value.charCodeAt(0)<=57)){
14         oError.innerHTML="第一位只能是字母";
15        isError=false;
16         return isError;
17     } else {
18         for (var i=0 ; i<oUname.value.length;i++){
19            if (oUname.value.charCodeAt(i)<48 || (oUname.value.charCodeAt(i)>57)&&(oUname.value.charCodeAt(i)<97)|| oUname.value.charCodeAt(i)>122){
20                oError.innerHTML="只能是字母或数字";
21                isNotError=false;
22                return isError;
23            }
24         }
25     }
26     if(oUpass.value.length<6 || oUpass.value.length>12){
27         oError.innerHTML="密码6-12位";
28         isError=false;
29         return isError;
30     }
31     if (oUpass1.value!=oUpass.value ) {
32         oError.innerHTML = "两次输入密码不一致！";
33         isError=false;
34         return isError;
35     }
36     return isError;
37     window.alert("注册成功")
38 }

<div class="box">
    <h2>REGISTER</h2>
     <form action="{{url_for('register') }}" method="post">
         <div class="input_box">
            　用户名：<input id="uname" type="text" placeholder="请输入用户名" name="'username"><br>
         </div>
         <div class="input_box">
              昵称：<input id="nickname" type="text" placeholder="请输入昵称" name="'nickname"><br>
         </div>
         <div class="input_box">
            　密码：<input id="upass" type="password" placeholder="请输入密码" name="'password"><br>
         </div>
         <div class="input_box">
            　验证：<input id="upass1" type="password" placeholder="再输入密码">
         </div>
        <div id="error_box"> </div><br>

         <div class="input_box">
            <button onclick="fnLogin()" >register</button>
         </div>
     </form>
</div>

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)

# /创建用户模型
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)
    nickname=db.Column(db.String(50))
#db.create_all()
# #增加
# user =User(username = 'nini',password = '11122')
# db.session.add(user)
# db.session.commit()
#
# #查询
# user=User.query.filter(User.username =='nini').first()
# print(user.username,user.password)
#
# #删除
# user=User.query.filter(User.username =='nini').first()
# db.session.delete(user)
# db.session.commit()
#
# #修改
# user=User.query.filter(User.username =='nini').first()
# user.password='11122333'
# db.session.commit()


#db.create_all()

#@app.route('/')      
                      
#def hello_world():
    #return 'Hello World!'

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

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

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


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