tracingChannel.hasSubscribers

• 返回：如果任何单独的通道有订阅者，则返回 true；如果没有，则返回 false。

这是 TracingChannel 实例上可用的一个辅助方法，用于检查是否有任何 TracingChannel 通道 拥有订阅者。如果其中任何一个至少有一个订阅者，则返回 true，否则返回 false。

【This is a helper method available on a TracingChannel instance to check if any of the TracingChannel Channels have subscribers. A true is returned if any of them have at least one subscriber, a false is returned otherwise.】

import diagnostics_channel from 'node:diagnostics_channel';

const channels = diagnostics_channel.tracingChannel('my-channel');

if (channels.hasSubscribers) {
  // Do something
}const diagnostics_channel = require('node:diagnostics_channel');

const channels = diagnostics_channel.tracingChannel('my-channel');

if (channels.hasSubscribers) {
  // Do something
}拷贝