debug调试工具 - 模具行业软件开发——模具行业从业者必备知识手册

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<h2>debug</h2>
<a href="https://opencollective.com/debug/backers/badge.svg"><img src="#backers" alt="OpenCollective</a>">
<a href="https://opencollective.com/debug/sponsors/badge.svg"><img src="#sponsors" alt="OpenCollective</a>">

A tiny JavaScript debugging utility modelled after Node.js core's debugging
technique. Works in Node.js and web browsers.

<h3>Installation</h3>

<pre><code>
$ npm install debug
</code></pre>

<h3>Usage</h3>

<code>debug</code> exposes a function; simply pass this function the name of your module, and it will return a decorated version of <code>console.error</code> for you to pass debug statements to. This will allow you to toggle the debug output for different parts of your module as well as the module as a whole.

Example <a href="./examples/node/app.js">app.js</a>:

<pre><code>
var debug = require('debug')('http')
, http = require('http')
, name = 'My App';

// fake app

debug('booting %o', name);

http.createServer(function(req, res){
debug(req.method + ' ' + req.url);
res.end('hello\n');
}).listen(3000, function(){
debug('listening');
});

// fake worker of some kind

require('./worker');
</code></pre>

Example <a href="./examples/node/worker.js">worker.js</a>:

<pre><code>
var a = require('debug')('worker:a')
, b = require('debug')('worker:b');

function work() {
a('doing lots of uninteresting work');
setTimeout(work, Math.random() * 1000);
}

work();

function workb() {
b('doing some work');
setTimeout(workb, Math.random() * 2000);
}

workb();
</code></pre>

The <code>DEBUG</code> environment variable is then used to enable these based on space or
comma-delimited names.

Here are some examples:

#### Windows command prompt notes

##### CMD

On Windows the environment variable is set using the <code>set</code> command.

<pre><code>
set DEBUG=*,-not_this
</code></pre>

Example:

<pre><code>
set DEBUG=* & node app.js
</code></pre>

##### PowerShell (VS Code default)

PowerShell uses different syntax to set environment variables.

<pre><code>
$env:DEBUG = "*,-not_this"
</code></pre>

Example:

<pre><code>
$env:DEBUG='app';node app.js
</code></pre>

Then, run the program to be debugged as usual.

npm script example:
<pre><code>
"windowsDebug": "@powershell -Command $env:DEBUG='*';node app.js",
</code></pre>

<h3>Namespace Colors</h3>

Every debug instance has a color generated for it based on its namespace name.
This helps when visually parsing the debug output to identify which debug instance
a debug line belongs to.

#### Node.js

In Node.js, colors are enabled when stderr is a TTY. You also should install
the <a href="https://npmjs.org/supports-color"><code>supports-color</code></a> module alongside debug,
otherwise debug will only use a small handful of basic colors.

#### Web Browser

Colors are also enabled on "Web Inspectors" that understand the <code>%c</code> formatting
option. These are WebKit web inspectors, Firefox (since version
31)
and the Firebug plugin for Firefox (any version).

<h3>Millisecond diff</h3>

When actively developing an application it ca

<hr>
还有什么补充参数吗？一起完善。