- js文件： onclick函数return True时才提交表单，return False时不提交表单。
- html文件：
- <form>中设置 action和method="post"
- <input> 中设置 name
- 主py文件中：
- from flask import request, redirect, url_for
- @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
1
function myLogin() {
var oUname = document.getElementById("umane");
var oError = document.getElementById("error_box");
var oUpass = document.getElementById("upass");
oError.innerHTML = "<br>"
//oUname
if (oUname.value.length>12 || oUname.value.length<6){
oError.innerHTML = "用户名必须为6到12位数";
return;
} else if((oUname.value.charCodeAt(0)>=48) && oUname.value.charCodeAt(0)<=57){
oError.innerHTML = "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 = "用户名只能包含字母和数字";
return;
}
}
if(upass.value.length>12 || upass.value.length<6){
oError.innerHTML="密码为6到12位数";
return;
}
window.alert("已成功登陆")
if(oCheckpass.value!=oUpass.value) {
oError.innerHTML = "sorry,the password is false";
return false;
}
2
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link rel="stylesheet" type="text/css" href="../static/css/1234.css">
<script src="../static/js/123.js"></script>
</head>
<body>
<form action="{{ url_for('regist') }}" method="post" >
<div class="Outbox">
<div class="box">
<h2>欢迎来到博客园，代码改变世界！</h2>
<h3>登录页面</h3>
<div class="input_box">
账号：<input id="umane"type="text"placeholder="请输入账号">
</div>
<div class="input_box">
密码：<input id="upass"type="password"placeholder="请输入密码">
</div>
<div id="error_box"><br></div>
<div class="input_box">
<button onclick="myLogin()">登录</button>
<button onclick=window.alert("请重新输入")>取消</button></div>
</div>
</div>
</form>
</body>
</html>
3
from flask import Flask, render_template,redirect,url_for,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()
@app.route('/')
def index():
return render_template('index.html')
@app.route('/regist/',methods=['GET','POST'])
def regist():
if request.method == 'GET':
return render_template("regist.html")
else:
username = request.form.get("username")
password = request.form.get("password")
user = User.query.filter(User.username == username).first()
if user:
return 'username existed.'
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('/login/')
def login():
return render_template("login.html")
if __name__ == '__main__':
app.run(debug=True)