tls.rootCertificates
不可变的字符串数组，代表当前 Node.js 版本提供的捆绑 Mozilla CA 存储中的根证书（PEM 格式）。
Node.js 提供的捆绑 CA 存储是 Mozilla CA 存储的快照，在发布时已修复。 它在所有支持的平台上都是相同的。
An immutable array of strings representing the root certificates (in PEM format) from the bundled Mozilla CA store as supplied by the current Node.js version.
The bundled CA store, as supplied by Node.js, is a snapshot of Mozilla CA store that is fixed at release time. It is identical on all supported platforms.