[英]Node.js - performance.now is not a function
I have a Node.js app. 我有一个Node.js应用。 When I run
node -v
from the command-line, I see the following: 当我从命令行运行
node -v
,我看到以下内容:
v10.3.0 V10.3.0
This is relevant because I'm interested in using the Performance Hooks . 这很重要,因为我对使用Performance Hooks感兴趣。 I've created the most basic thing I can think of, which looks like this in an in a file named 'index.js':
我创建了我能想到的最基本的东西,它看起来像在一个名为“ index.js”的文件中:
const performance = require('perf_hooks');
let p = performance.now();
When I run node index.js
from the command-line, I get an error that says: 当我从命令行运行
node index.js
,出现错误消息:
TypeError: performance.now is not a function TypeError:performance.now不是函数
Why am I getting this error? 为什么会出现此错误? What am I missing?
我想念什么?
The perf_hooks
module exports several things, one of them is performance
, so using object destructuring you could do: perf_hooks
模块导出了几件事,其中之一是performance
,因此使用对象perf_hooks
可以做到:
const { performance } = require('perf_hooks');
Or with object access: 或通过对象访问:
const performance = require('perf_hooks').performance;
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