# debug
[![Build Status](https://travis-ci.org/visionmedia/debug.svg?branch=master)](https://travis-ci.org/visionmedia/debug) [![Coverage Status](https://coveralls.io/repos/github/visionmedia/debug/badge.svg?branch=master)](https://coveralls.io/github/visionmedia/debug?branch=master) [![Slack](https://visionmedia-community-slackin.now.sh/badge.svg)](https://visionmedia-community-slackin.now.sh/) [![OpenCollective](https://opencollective.com/debug/backers/badge.svg)](#backers)
[![OpenCollective](https://opencollective.com/debug/sponsors/badge.svg)](#sponsors)
<img width="647" src="https://user-images.githubusercontent.com/71256/29091486-fa38524c-7c37-11e7-895f-e7ec8e1039b6.png">
A tiny JavaScript debugging utility modelled after Node.js core's debugging
technique. Works in Node.js and web browsers.
## Installation
```bash
$ npm install debug
```
## Usage
`debug` exposes a function; simply pass this function the name of your module, and it will return a decorated version of `console.error` 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 [_app.js_](./examples/node/app.js):
```js
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');
```
Example [_worker.js_](./examples/node/worker.js):
```js
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();
```
The `DEBUG` environment variable is then used to enable these based on space or
comma-delimited names.
Here are some examples:
<img width="647" alt="screen shot 2017-08-08 at 12 53 04 pm" src="https://user-images.githubusercontent.com/71256/29091703-a6302cdc-7c38-11e7-8304-7c0b3bc600cd.png">
<img width="647" alt="screen shot 2017-08-08 at 12 53 38 pm" src="https://user-images.githubusercontent.com/71256/29091700-a62a6888-7c38-11e7-800b-db911291ca2b.png">
<img width="647" alt="screen shot 2017-08-08 at 12 53 25 pm" src="https://user-images.githubusercontent.com/71256/29091701-a62ea114-7c38-11e7-826a-2692bedca740.png">
#### Windows command prompt notes
##### CMD
On Windows the environment variable is set using the `set` command.
```cmd
set DEBUG=*,-not_this
```
Example:
```cmd
set DEBUG=* & node app.js
```
##### PowerShell (VS Code default)
PowerShell uses different syntax to set environment variables.
```cmd
$env:DEBUG = "*,-not_this"
```
Example:
```cmd
$env:DEBUG='app';node app.js
```
Then, run the program to be debugged as usual.
npm script example:
```js
"windowsDebug": "@powershell -Command $env:DEBUG='*';node app.js",
```
## Namespace Colors
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 [`supports-color`](https://npmjs.org/supports-color) module alongside debug,
otherwise debug will only use a small handful of basic colors.
<img width="521" src="https://user-images.githubusercontent.com/71256/29092181-47f6a9e6-7c3a-11e7-9a14-1928d8a711cd.png">
#### Web Browser
Colors are also enabled on "Web Inspectors" that understand the `%c` formatting
option. These are WebKit web inspectors, Firefox ([since version
31](https://hacks.mozilla.org/2014/05/editable-box-model-multiple-selection-sublime-text-keys-much-more-firefox-developer-tools-episode-31/))
and the Firebug plugin for Firefox (any version).
<img width="524" src="https://user-images.githubusercontent.com/71256/29092033-b65f9f2e-7c39-11e7-8e32-f6f0d8e865c1.png">
## Millisecond diff
When actively developing an application it can be useful to see when the time spent between one `debug()` call and the next. Suppose for example you invoke `debug()` before requesting a resource, and after as well, the "+NNNms" will show you how much time was spent between calls.
<img width="647" src="https://user-images.githubusercontent.com/71256/29091486-fa38524c-7c37-11e7-895f-e7ec8e1039b6.png">
When stdout is not a TTY, `Date#toISOString()` is used, making it more useful for logging the debug information as shown below:
<img width="647" src="https://user-images.githubusercontent.com/71256/29091956-6bd78372-7c39-11e7-8c55-c948396d6edd.png">
## Conventions
If you're using this in one or more of your libraries, you _should_ use the name of your library so that developers may toggle debugging as desired without guessing names. If you have more than one debuggers you _should_ prefix them with your library name and use ":" to separate features. For example "bodyParser" from Connect would then be "connect:bodyParser". If you append a "*" to the end of your name, it will always be enabled regardless of the setting of the DEBUG environment variable. You can then use it for normal output as well as debug output.
## Wildcards
The `*` character may be used as a wildcard. Suppose for example your library has
debuggers named "connect:bodyParser", "connect:compress", "connect:session",
instead of listing all three with
`DEBUG=connect:bodyParser,connect:compress,connect:session`, you may simply do
`DEBUG=connect:*`, or to run everything using this module simply use `DEBUG=*`.
You can also exclude specific debuggers by prefixing them with a "-" character.
For example, `DEBUG=*,-connect:*` would include all debuggers except those
starting with "connect:".
## Environment Variables
When running through Node.js, you can set a few environment variables that will
change the behavior of the debug logging:
| Name | Purpose |
|-----------|-------------------------------------------------|
| `DEBUG` | Enables/disables specific debugging namespaces. |
| `DEBUG_HIDE_DATE` | Hide date from debug output (non-TTY). |
| `DEBUG_COLORS`| Whether or not to use colors in the debug output. |
| `DEBUG_DEPTH` | Object inspection depth. |
| `DEBUG_SHOW_HIDDEN` | Shows hidden properties on inspected objects. |
__Note:__ The environment variables beginning with `DEBUG_` end up being
converted into an Options object that gets used with `%o`/`%O` formatters.
See the Node.js documentation for
[`util.inspect()`](https://nodejs.org/api/util.html#util_util_inspect_object_options)
for the complete list.
## Formatters
Debug uses [printf-style](https://wikipedia.org/wiki/Printf_format_string) formatting.
Below are the officially supported formatters:
| Formatter | Representation |
|-----------|----------------|
| `%O` | Pretty-print an Object on multiple lines. |
| `%o` | Pretty-print an Object all on a single line. |
| `%s` | String. |
| `%d` | Number (both integer and float). |
| `%j` | JSON. Replaced with the string '[Circular]' if the argument contains circular references. |
| `%%` | Single percent sign ('%'). This does not consume an argument. |
### Custom formatters
You can add custom formatters by extending the `debug.formatters` object.
For example, if you wanted to add support for rendering a Buffer as hex with
`%h`, you could do something like:
```js
const createDebug = require('debug')
createDebug.formatters.h = (v) => {
return v.toString('hex')
}
// …elsewhere
const debug = createDebug('foo')
debug('this is hex: %h', new Buffer('hello world'))
// foo this is hex: 68656c6c6f20776f726c6421 +0ms
```
## Browser Support
You can build a browser-ready script using [browserify](https://github.com/substack/node-b
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基于STM32设计的物联网UWB定位系统.zip(毕设/大创/竞赛/立项/项目开发) (1509个子文件)
LCD.axf 688KB
main.axf 456KB
deca_device.c 138KB
deca_device.c 138KB
stm32f4xx_tim.c 119KB
stm32f10x_tim.c 104KB
stm32f4xx_rtc.c 98KB
stm32f4xx_rcc.c 94KB
lcd.c 88KB
fonts.c 80KB
stm32f4xx_adc.c 66KB
stm32f4xx_flash.c 60KB
stm32f10x_flash.c 59KB
stm32f4xx_can.c 57KB
stm32f4xx_usart.c 55KB
stm32f4xx_cryp_aes.c 55KB
stm32f4xx_fmc.c 54KB
stm32f4xx_i2c.c 52KB
stm32f4xx_dma.c 50KB
stm32f4xx_spi.c 50KB
stm32f10x_rcc.c 49KB
bsp_ili9341_lcd.c 47KB
system_stm32f4xx.c 45KB
stm32f10x_adc.c 45KB
stm32f4xx_sai.c 44KB
stm32f10x_i2c.c 43KB
stm32f10x_can.c 43KB
stm32f4xx_fsmc.c 40KB
stm32f4xx_ltdc.c 38KB
stm32f4xx_sdio.c 37KB
stm32f10x_usart.c 36KB
stm32f4xx_pwr.c 36KB
trilateration.c 35KB
trilateration.c 35KB
system_stm32f10x.c 35KB
stm32f10x_fsmc.c 34KB
stm32f4xx_cryp.c 34KB
stm32f10x_spi.c 29KB
stm32f10x_dma.c 28KB
stm32f10x_sdio.c 27KB
stm32f4xx_dma2d.c 26KB
stm32f4xx_dac.c 25KB
stm32f4xx_hash.c 25KB
bsp_xpt2046_lcd.c 25KB
stm32f4xx_gpio.c 24KB
palette.c 22KB
stm32f10x_gpio.c 22KB
ds_twr_init.c 21KB
port.c 20KB
UI.c 20KB
ds_twr_resp.c 19KB
stm32f10x_dac.c 18KB
ds_twr_resp.c 18KB
stm32f4xx_dcmi.c 18KB
matrix.c 18KB
ds_twr_init.c 17KB
core_cm3.c 16KB
bsp_spi_flash.c 15KB
ss_twr_resp.c 15KB
ss_twr_resp.c 15KB
ss_twr_init.c 14KB
ss_twr_init.c 14KB
Bmp.c 14KB
ESP8266.c 14KB
deca_range_tables.c 13KB
deca_range_tables.c 13KB
stm32f4xx_rng.c 13KB
port.c 13KB
matrix.c 12KB
stm32f10x_cec.c 11KB
misc.c 11KB
stm32f4xx_cryp_tdes.c 10KB
stm32f4xx_wwdg.c 10KB
stm32f4xx_exti.c 9KB
stm32f4xx_cryp_des.c 9KB
stm32f4xx_hash_sha1.c 9KB
stm32f4xx_syscfg.c 9KB
stm32f4xx_hash_md5.c 9KB
stm32f4xx_iwdg.c 9KB
stm32f10x_pwr.c 8KB
stm32f10x_rtc.c 8KB
stm32f10x_bkp.c 8KB
delay.c 7KB
misc.c 7KB
trilateration_EKF.c 7KB
stm32f10x_exti.c 7KB
stm32f4xx_dbgmcu.c 6KB
stm32f10x_wwdg.c 5KB
kalman.c 5KB
kalman.c 5KB
stm32f4xx_flash_ramfunc.c 5KB
OLED_SPI.c 5KB
stm32f10x_dbgmcu.c 5KB
usart.c 5KB
stm32f10x_iwdg.c 5KB
stm32f10x_it.c 4KB
stm32f4xx_it.c 4KB
usart3.c 4KB
deca_spi.c 4KB
stm32f4xx_crc.c 3KB
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