完成登录功能，用session记住用户名

登录功能完成：

  1. js:设置return
  2. html:设置
    1. form
    2. input
    3. onclick="return fnLogin()"
  3. py:
    1. @app.route设置methods
    2. GET
    3. POST
      1. 读取表单数据
      2. 查询数据库
        1. 用户名密码对：
          1. 记住用户名
          2. 跳转到首页
        2. 用户名密码不对：
          1. 提示相应错误。

session：

  1. 从`flask`中导入`session`
  2. 设置`SECRET_KEY`
  3. 操作字典一样操作`session`：增加用户名`session['username']=`username

html:

{% extends'base.html' %}
    {% block title %}
    登录
    {% endblock %}
{% block head %}

    <link rel="stylesheet"type="text/css"href="{{ url_for('static',filename='css/login.css') }}">
    <script src="{{ url_for('static',filename='js/login.js') }}"></script>
{% endblock %}
{% block main %}

<body>

<div class="aa" >
    <div class="login" ><h2>登录</h2></div>

    <form action="{{ url_for('login')}}" method="post">

    <div class="aa1" >
        账号：<input id="name" type="text" name="username" placeholder="请输入用户名"><br>
        密码：<input id="password" type="password" name="password" placeholder="请输入密码"><br>
        </div>
        <div id="error_box"><br></div>
      <div class="aa2" >
         <button onclick="return myLogin()">登录</button>
         <button type="button" onclick=window.alert("是否取消登录！")>取消</button>


    </div>
</div>
</body>
{% endblock %}

 

js:

function myLogin() {
        var oUname = document.getElementById("name")
        var oError = document.getElementById("error_box")
        var opassword = document.getElementById("password")
        oError.innerHTML = "<br>"
         if(oUname.value.length<6||oUname.value.length>12){
                oError.innerHTML="用户名需为6-12位";
                isError=false;
                return isError;
            }

          else if ((oUname.value.charCodeAt(0)>=48) && oUname.value.charCodeAt(0)<=57){
             oError.innerHTML="首字母不能是数字";
            isError=false;
                return isError;

         }

         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="只能包含字母和数字";
               isError=false;
                return isError;
             }
             }
         if(opassword.value.length<6||opassword.value.length>12){
                oError.innerHTML="密码需为6-12位";
                isError=false;
                return isError;
            }
            return true;
            //window.alert("登录成功！")
             }

python:

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__ = '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)
# db.create_all()





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

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

@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('shouye'))
            else:
                return u'password error'
        else:
            return u'username is not existed.'



@app.route('/zhuce/',methods=['GET','POST'])
def zhuce():
    if request.method == 'GET':
        return render_template('zhuce.html')
    else:
        usern = request.form.get('username')
        passw = request.form.get('password')
        user = User.query.filter(User.username == usern).first()
        if user:
            return u'username existed'
        else:
            user1 = User(username=usern, password=passw)
            db.session.add(user1)
            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)

session:

import os
SECRET_KEY = os.urandom(24)

SQLALCHEMY_DATABASE_URI = 'mysql+pymysql://root:@localhost:3306/mis_db?charset=utf8'
SQLALCHEMY_TRACK_MODIFICATIONS = False

 

 

 

 

 

posted on 2017-11-22 18:22  097吴嘉玲  阅读(216)  评论(0)    收藏  举报

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