cookie

浏览器端的会话机制，不能跨域名和浏览器，不能保证数据的安全性，支持过期，存储大小受限制

读：

request.cookie(key)

写：

response.set_cookie(key,value,过期时间(秒))

删除：

response.delete_cookie(key)

举例：

#登录api

@user.route("/login/" ,methods=["GET","POST"])

def login_api():

    if request.method == "GET":
        return render_template("login.html")
    elif request.method=="POST":
        params = request.form
        user_name = params.get("uname")
        # 设置cookie
        response = redirect(url_for('user.user_index'))
        response.set_cookie("uname",user_name)
        return response
    else:
        abort(405)

#退出
@user.route("/logout/")
def logout_api():
    # response = make_response()
    # #删除cookie
    response = redirect(url_for('user.user_index'))
    response.delete_cookie("uname")
    return response
#index页面api
@user.route("/index/")
def user_index():

    user_name = request.cookies.get("uname","游客")#读cookie
    return render_template("index.html",uname=user_name)