emitter[Symbol.for('nodejs.rejection')](err, eventName[, ...args])
稳定性: 1 - captureRejections 是实验的。
Symbol.for('nodejs.rejection')
方法被调用,以防在触发事件时发生 promise 拒绝,并且在触发器上启用了 captureRejections
。
可以使用 events.captureRejectionSymbol
代替 Symbol.for('nodejs.rejection')
。
const { EventEmitter, captureRejectionSymbol } = require('events');
class MyClass extends EventEmitter {
constructor() {
super({ captureRejections: true });
}
[captureRejectionSymbol](err, event, ...args) {
console.log('rejection happened for', event, 'with', err, ...args);
this.destroy(err);
}
destroy(err) {
// 把这里的资源卸除。
}
}
Stability: 1 - captureRejections is experimental.
The Symbol.for('nodejs.rejection')
method is called in case a
promise rejection happens when emitting an event and
captureRejections
is enabled on the emitter.
It is possible to use events.captureRejectionSymbol
in
place of Symbol.for('nodejs.rejection')
.
const { EventEmitter, captureRejectionSymbol } = require('events');
class MyClass extends EventEmitter {
constructor() {
super({ captureRejections: true });
}
[captureRejectionSymbol](err, event, ...args) {
console.log('rejection happened for', event, 'with', err, ...args);
this.destroy(err);
}
destroy(err) {
// Tear the resource down here.
}
}