正文
@startuml
title 用户登录时序图
actor 用户 as User
participant "前端" as Web
participant "认证服务" as Auth
participant "数据库" as DB
User -> Web: 输入用户名密码
Web -> Auth: 发送认证请求
Auth -> DB: 验证用户信息
DB --> Auth: 返回验证结果
Auth --> Web: 生成Token
Web --> User: 返回登录成功
@enduml
abc = def
cde = good
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