在线画时序图的网站：https://www.websequencediagrams.com/
该网站提供拖拉图形和编写脚本代码2个方式来制作时序图，同时提供多种显示风格。
实例：
1、脚本代码：
title Automated test data generation tool
parallel {
user->+tool: Open program
tool-->-user: Return login interface
user->+tool: Log in
tool->+DB: Connection request
DB-->-tool: Successful response
tool-->-user: Return the list of database tables
user->+tool: Select database tables
tool->+DB: Query request
DB-->-tool: Successful response
tool-->-user: Return data generation rule configuration interface
user-->+tool: Configuration rule and execution
tool-->+DB: Execution request
DB-->-tool:Successful response
tool-->-user: Return successful interface
}
2、自动生成的时序图：
