完成登录功能,用session记住用户名
Posted 郑淑莹
tags:
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登录功能完成:
- js:设置return
- html:设置
- form
- input
-
onclick="return fnLogin()"
- py:
- @app.route设置methods
- GET
- POST
- 读取表单数据
- 查询数据库
- 用户名密码对:
- 记住用户名
- 跳转到首页
- 用户名密码不对:
- 提示相应错误。
- 用户名密码对:
session:
- 从`flask`中导入`session`
- 设置`SECRET_KEY`
- 操作字典一样操作`session`:增加用户名`session[\'username\']=`username
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__=\'users\' 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() #查 #user = User.query.filter(User.username == \'sk\').first() #print(user.id,user.password) #改 #user = User.query.filter(User.username == \'mis1234\').first() #user.password=\'888888\' #user.username=\'sk\' #db.session.commit() #print(user.id,user.password) #删 #user = User.query.filter(User.username==\'sk\').first() #db.session.delete(user) #db.session.commit() #增 #user = User(username=\'mis1234\',password=\'111111\') #db.session.add(user) #db.session.commit() @app.route(\'/\') def index(): return render_template(\'base.html\') @app.route(\'/register/\',methods=[\'GET\',\'POST\']) def register(): if request.method==\'GET\': return render_template(\'register.html\') else: usern = request.form.get(\'username\') nickn = request.form.get(\'nickname\') 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,nickname = nickn) db.session.add(user1) db.session.commit() return redirect(url_for(\'login\')) @app.route(\'/login/\',methods=[\'GET\',\'POST\']) def login(): if request.method==\'GET\': return render_template(\'login.html\') else: usern = request.form.get(\'username\') passw = request.form.get(\'password\') user = User.query.filter(User.username == usern).first() if user: if user.password==passw: session[\'user\']=usern return redirect(url_for(\'index\')) else: return \'password error.\' else: return \'username is not existed.\' @app.route(\'/question\') def question(): return render_template(\'question.html\') if __name__ == \'__main__\': app.run()
import os SQLALCHEMY_DATABASE_URI = \'mysql+pymysql://root:@127.0.0.1:3306/mis_db?charset=utf8\' SQLALCHEMY_TRACK_MODIFICATIONS = False SECRET_KEY = os.urandom(24)
function fnLogin() { var oUsername = document.getElementById("username"); var oUserpass = document.getElementById("userpass"); var oError = document.getElementById("error_box"); oError.innerHTML = "<br>"; if (oUsername.value.length > 20 || oUsername.value.length < 6) { oError.innerHTML = "用户名6到20位"; return false; } else if ((oUsername.value.charCodeAt(0) >= 48) && oUsername.value.charCodeAt(0) <= 57) { oError.innerHTML = "first number"; return false; } else for (var i = 0; i < oUsername.value.length; i++) { if ((oUsername.value.charCodeAt(i) < 48 || oUsername.value.charCodeAt(i) > 57) && (oUsername.value.charCodeAt(i) < 97 || oUsername.value.charCodeAt(i) > 122)) { oError.innerHTML = "only letter or name."; return false; } } if (oUserpass.value.length > 20 || oUserpass.value.length < 6) { oError.innerHTML = "密码6到20位"; return false; } else if ((oUserpass.value.charCodeAt(0) >= 48) && oUserpass.value.charCodeAt(0) <= 57){ oError.innerHTML = "first number"; return false; } return true //window.alert("登录成功!") }
{% extends\'base.html\' %} {% block title %} 登录 {% endblock %} {% block head %} <link rel="stylesheet" type="text/css" href="{{ url_for(\'static\',filename=\'css/js23.css\') }}"> <script src="{{ url_for(\'static\',filename=\'js/js23.js\') }}"></script> {% endblock %} {% block main %} <div class="bg-img"> <div class="box"> <form action="{{ url_for(\'login\') }}" method="post"> <h1>登录</h1> <div class="input_box"> <h3>username</h3> <input id="username" type="text" placeholder="请输入用户名" name="username"> </div> <div class="input_box"> <h3>userpass</h3> <input id="userpass" type="password" placeholder="请输入密码" name="password"> </div> <br> <div class="link_box"> <a href="{{ url_for(\'register\') }}"> 没有账号,立即注册 <b> ></b> </a> </div> <div id="error_box"><br></div> <div class="input_box"> <button onclick="return fnLogin()">LOGIN</button> <button onclick=window.alert(fnLogin())>RESET</button> </div> </form> </div> </div> {% endblock %}
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