默认情况下不启用基于网络的加载

目前，需要 --experimental-network-imports 标志来启用通过 http: 或 https: 加载资源。 将来，将使用不同的机制来执行此操作。 需要选择加入以防止不经意间使用可能影响 Node.js 应用程序可靠性的潜在可变状态的传递依赖关系。

For now, the --experimental-network-imports flag is required to enable loading resources over http: or https:. In the future, a different mechanism will be used to enforce this. Opt-in is required to prevent transitive dependencies inadvertently using potentially mutable state that could affect reliability of Node.js applications.