节点订阅工具是Node.js中的一个重要功能，用于管理服务的订阅。以下是使用节点订阅工具的步骤和一些关键点

了解节点订阅的基本概念

• 订阅：当服务发生改变（如版本更新、异常或其他依赖项变化）时，节点会自动订阅新的服务。
• 订阅工具：Node.js提供丰富的订阅工具，包括npm --node、npm node等工具。

配置订阅工具

• 使用npm配置订阅：

  npm node --node --enqueue --output json --node-two

  这会生成一个JSON日志文件,包含订阅信息。

在服务启动时预览订阅

• 运行服务：在服务启动时，使用npm --node或npm node start --enqueue运行。
• 查看日志：运行npm --node --enqueue --output json --node-two，查看日志文件。

在需要时订阅服务

• 运行服务：在需要订阅服务时，使用npm --node或npm node start --enqueue运行。
• 订阅服务：在服务启动后，查看JSON日志，找到服务ID，并在node配置文件中添加[services] [id]，其中[id]是服务的nodeid。
• 设置订阅策略：在node配置文件中，添加订阅策略，

  [services]
  [nodeid="service-id"]
  [tags] = []
  [actions] = []
  [env] = {}
  [nodeid] = service-id
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