js在浏览器中对cookie进行增删改查

<name>=<value>; <attribute>; <attribute>
eg:
id=a3fWa; Expires=Wed, 21 Oct 2015 07:28:00 GMT; Secure; HttpOnly

A cookie associated with a cross-site resource at  was set without the `SameSite` attribute. 
A future release of Chrome will only deliver cookies with cross-site requests 
if they are set with `SameSite=None` and `Secure`.

# -*- coding: utf-8 -*-
from flask import Flask, send_file
app = Flask(__name__)
@app.route("/")
def get_info():
    return send_file("templates/index.html")
if __name__ == '__main__':
    app.run(debug=True)

// 创建Cookie 可以连续赋值，不会被覆盖
document.cookie="username=Tom";
document.cookie="age=12";
// 修改Cookie
document.cookie="username=Jack";
// 获取Cookie
console.log(document.cookie);
// age=12; username=Jack
// 删除  设置 expires 参数为以前的时间
document.cookie = "username=; expires=Thu, 01 Jan 1970 00:00:00 GMT";