async_hooks.executionAsyncId()

• 返回:<number> 当前执行上下文的 asyncId。当有调用时对跟踪很有用。

  \Returns: <number> The asyncId of the current execution context. Useful to track when something calls.

import { executionAsyncId } from 'node:async_hooks';
import fs from 'node:fs';
console.log(executionAsyncId()); // 1 - bootstrap
const path = '.';
fs.open(path, 'r', (err, fd) => {
 console.log(executionAsyncId()); // 6 - open()
});const async_hooks = require('node:async_hooks');
const fs = require('node:fs');
console.log(async_hooks.executionAsyncId()); // 1 - bootstrap
const path = '.';
fs.open(path, 'r', (err, fd) => {
 console.log(async_hooks.executionAsyncId()); // 6 - open()
});拷贝

executionAsyncId() 返回的 ID 与执行时机有关,与因果无关(被 triggerAsyncId() 涵盖):

\The ID returned from executionAsyncId() is related to execution timing, not causality (which is covered by triggerAsyncId()):

const server = net.createServer((conn) => {
 // Returns the ID of the server, not of the new connection, because the
 // callback runs in the execution scope of the server's MakeCallback().
 async_hooks.executionAsyncId();
}).listen(port, () => {
 // Returns the ID of a TickObject (process.nextTick()) because all
 // callbacks passed to .listen() are wrapped in a nextTick().
 async_hooks.executionAsyncId();
}); 拷贝

默认情况下,promise 上下文可能无法获得精确的 executionAsyncIds。请参阅 promise 执行跟踪 部分。

\Promise contexts may not get precise executionAsyncIds by default. See the section on promise execution tracking.