完成登录功能,用session记住用户名
登录功能完成:
- js:设置return
function fnLogin() { var oUname = document.getElementById("uname"); var oError = document.getElementById("error_box"); var oUpass = document.getElementById("upass"); var isError=true; oError.innerHTML="<br>" if(oUname.value.length<6 || oUname.value.length >12){ oError.innerHTML="用户名6-12位"; return false; }else if ((oUname.value.charCodeAt(0)>=48) && (oUname.value.charCodeAt(0)<=57)){ oError.innerHTML="第一位只能是字母"; return false; } 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="只能是字母或数字"; return false; } } if(oUpass.value.length<6 || oUpass.value.length>12){ oError.innerHTML="密码6-12位"; return false; } return true; window.alert("登录成功") }
- html:设置
- form
- input
-
onclick="return fnLogin()"
{% extends'base.html' %} {% block title %} 登录 {% endblock %} {% block head %} <link href="../static/css/hh.css" rel="stylesheet" type="text/css"> <script src="../static/js/dl.js"></script> {% endblock %} {% block main %} <body><br><br><br> <div><h1>武林|登录</h1></div> <div class="box"> <form action="{{ url_for('login') }}" method="post"> <div class="input_box"> 姓名:<input type="text" id="uname" name="username" placeholder="敢问阁下大名"> </div> <br> <div class="input_box"> 密码:<input type="password" id="upass" name="password" placeholder="请输入通关密码"> </div> <br> <div id="error_box"><br></div> <div class="input_box"> <button onclick="return fnLogin()">登录</button> </div> <br> </div> </div> {% endblock %} </body> </html>
- 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,url_for,redirect,request,session 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) nickname = db.Column(db.String(20)) # db.create_all() ''' user=User(username='hehe',password='1234567') db.session.add(user) db.session.commit() ''' @app.route('/') def hh(): return render_template('hh.html') @app.route('/login/',methods=['GET','POST']) def login(): if request.method == "GET": return render_template("dl.html") else: username = request.form.get("username") password = request.form.get("password") user = User.query.filter(User.username == username).first() if user: if user.password == password: session['user'] = username return redirect(url_for('login')) else: return '密码错误' else: return '用户名不存在' @app.route('/regist/',methods=['GET','POST']) def regist(): if request.method=='GET': return render_template("zc.html") else: username = request.form.get("username") password = request.form.get("password") user = User.query.filter(User.username == username).first() if user: return ' 用户名已存在' else: user = User(username=username, password=password) db.session.add(user)#数据库,添加操作 db.session.commit() return redirect(url_for('login')) @app.route('/wenda/') def wenda(): return render_template("wenda.html") if __name__ == '__main__': app.run(debug=True)
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)