Introduction to 1-1 inspector

Git bash common commands

• mkdir testNew folder
• cd testEnter folder
• cd ../Enter parent folder
• lsLists the files and folders under the current folder
• Code the name of the folder in the current directoryThe corresponding project can be opened through a global variable code provided by vscode

Vs Code for breakpoint debugging

Press F5 to start a websocket service for debugging, and the following will be printed on the debugging console:

D:\Program Files\nodejs\node.exe --inspect-brk=24775 app.js
Debugger listening on ws://127.0.0.1:24775/6cc7bcf1-c9fc-4f58-a819-2dd38e9fb9bf
For help, see: https://nodejs.org/en/docs/inspector

The corresponding HTTP service is:http://127.0.0.1:24775Add JSON at the end to view the corresponding meta informationhttp://127.0.0.1:24775/json

1-2 activation debugging

node --inspect app.jsAdd — inspect at runtime to activate debugging

Using express to build a service startup debugging

1. npm initInitialize a package manager and specify the entry file（ app.js )
2. npm install express --saveInstall express module
3. In the entry file app.js Write service code in

const express = require('express')
const app = express()

app.get('/', (req, res) => {
  res.send('hello world !')
})

app.listen('3000', () => {
  console.log ('Program runs on port 3000 ')
})

1. node --inspect app.jsRun the command to start debugging

Note: you need to set vscode, search for attach in the settings, and change the value of debug > node: Auto attach to on

1-3 ~ 4 debug client – chrome devtools

Start debugging client

• Method 1:

  1. Input in the Chrome browser chrome://inspect
  2. Select devices
  3. Click Configure… To configure done
  4. Then click inspect under target
• Method 2:
  The devtoolsfrontendurl in meta information can also be opened directly in the browser
  View meta information
• Law 3:
  Open the browser developer tool and click the green icon in the upper left corner to enter
• Law 4:
  Using the debugging function of vscode

1-5 debug client vscode

• Start method: shortcut key F5
• to configure: launch.json
• Print parameter list in node:console.log(process.argv)

Introduction of 1-6 command line parameters

• Official documents

This work is original and adopts the “signature – noncommercial use – no deduction 4.0 international” license agreement