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:存在报错

  不存在，存到数据库中

       redirect重定向到登录页

 

function myLogin() {
        var oUname = document.getElementById("name");
        var oError = document.getElementById("error_box");
        var opassword = document.getElementById("password");
        var opassword1 = document.getElementById("password1");
        var isError = true;
        oError.innerHTML="<br>";

         if(oUname.value.length<6||oUname.value.length>20){
                oError.innerHTML="用户名需为6-20个字符";
                isError = false;
                return isError;
            }
            else if((oUname.value.charCodeAt(0)>=48) && oUname.value.charCodeAt(0)<=57){
                oError.innerHTML="用户名首字母不能为数字";
                return;
            }
            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="用户名字符仅能为字母或数字";
                isError = false;
                return isError;
               }
            }

            if(opassword.value.length<6||opassword.value.length>20){
                oError.innerHTML="密码需在6-20个字符内";
                isError = false;
                return isError;
            }
            if (opassword1.value != opassword.value) {
               oError.innerHTML = "您输入的密码不一致！请重新输入！";
                isError = false;
                return isError;
            }
            window.alert("注册成功！");
                return isError;
             }

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)
    telephone = db.Column(db.String(11), nullable=False)


#db.create_all()

# 增加数据
# user=User(username = 'mis1234',password = '111111',telephone = '12345678900')
# db.session.add(user)
# db.session.commit()

# 查询数据

# user=User.query.filter(user.username == 'mis1234').first()
# print(user.username,user.password)


# 修改数据
# user=User.query.filter(user.username == 'mis1234').first()
# user.password = '000000'
# db.session.commit()

# 删除数据
# user=User.query.filter(user.username == 'mis1234').first()
# db.session.delete(user)
# db.session.commit()

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

@app.route('/register/',methods=['GET','POST'])
def register():
    if request.method == 'GET':
        return render_template('register.html')
    else:
        usern = request.form.get('username')
        telep = request.form.get('telephone')
        passw = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            return 'username existed.'
        else:
            user1 = User(username = usern,password = passw,telephone = telep)
            db.session.add(user1)#数据库操作
            db.session.commit()
            return redirect(url_for('login'))

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

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

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


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