nodejs使用笔记

一、http-errors制造错误信息返回给前端
var createError = require('http-errors')；
createError(401, 'Please login to view this page.')
express制造服务

const express = require('express')；
const app = express()；
 app.get('/', function (req, res) {
    
      res.send('Hello World')}) app.listen(3000)
cookie-parser

二、package.json文件笔记
{
    
    
  "name": "react-study",//应用程序或软件包的名称
  "version": "0.1.0",//当前的版本
  "description": "react-app used by 铠甲合体",//应用程序/软件包的简短描述。
  "private": true,//可以防止应用程序/软件包被意外地发布到 npm
  "dependencies": {
    
     //作为依赖安装的 npm 软件包的列表
    "@babel/core": "7.12.3",
    "@pmmmwh/react-refresh-webpack-plugin": "0.4.3",
    "@svgr/webpack": "5.5.0",
    "@testing-library/jest-dom": "^5.14.1",
    "@testing-library/react": "^11.2.7",
    "@testing-library/user-event": "^12.8.3",
    "@typescript-eslint/eslint-plugin": "^4.5.0",
    "@typescript-eslint/parser": "^4.5.0",
    "antd": "^4.16.12",
    "axios": "^0.21.1",
    "babel-eslint": "^10.1.0",
    "babel-jest": "^26.6.0",
    "babel-loader": "8.1.0",
    "babel-plugin-named-asset-import": "^0.3.7",
    "babel-preset-react-app": "^10.0.0",
    "bfj": "^7.0.2",
    "camelcase": "^6.1.0",
    "case-sensitive-paths-webpack-plugin": "2.3.0",
    "classnames": "^2.3.1",
    "css-loader": "4.3.0",
    "dotenv": "8.2.0",
    "dotenv-expand": "5.1.0",
    "eslint": "^7.11.0",
    "eslint-config-react-app": "^6.0.0",
    "eslint-plugin-flowtype": "^5.2.0",
    "eslint-plugin-import": "^2.22.1",
    "eslint-plugin-jest": "^24.1.0",
    "eslint-plugin-jsx-a11y": "^6.3.1",
    "eslint-plugin-react": "^7.21.5",
    "eslint-plugin-react-hooks": "^4.2.0",
    "eslint-plugin-testing-library": "^3.9.2",
    "eslint-webpack-plugin": "^2.5.2",
    "file-loader": "6.1.1",
    "fs-extra": "^9.0.1",
    "html-webpack-plugin": "4.5.0",
    "identity-obj-proxy": "3.0.0",
    "jest": "26.6.0",
    "jest-circus": "26.6.0",
    "jest-resolve": "26.6.0",
    "jest-watch-typeahead": "0.6.1",
    "mini-css-extract-plugin": "0.11.3",
    "optimize-css-assets-webpack-plugin": "5.0.4",
    "pnp-webpack-plugin": "1.6.4",
    "postcss-flexbugs-fixes": "4.2.1",
    "postcss-loader": "3.0.0",
    "postcss-normalize": "8.0.1",
    "postcss-preset-env": "6.7.0",
    "postcss-safe-parser": "5.0.2",
    "prompts": "2.4.0",
    "react": "^17.0.2",
    "react-app-polyfill": "^2.0.0",
    "react-dev-utils": "^11.0.3",
    "react-dom": "^17.0.2",
    "react-refresh": "^0.8.3",
    "react-router-dom": "^5.2.0",
    "resolve": "1.18.1",
    "resolve-url-loader": "^3.1.2",
    "sass-loader": "^10.0.5",
    "semver": "7.3.2",
    "style-loader": "1.3.0",
    "terser-webpack-plugin": "4.2.3",
    "ts-pnp": "1.2.0",
    "url-loader": "4.1.1",
    "web-vitals": "^1.1.2",
    "webpack": "4.44.2",
    "webpack-dev-server": "3.11.1",
    "webpack-manifest-plugin": "2.2.0",
    "workbox-webpack-plugin": "5.1.4"
  },
  "scripts": {
    
               //scripts 定义了一组可以运行的 node 脚本
    "start": "node scripts/start.js",
    "build": "node scripts/build.js",
    "test": "node scripts/test.js"
  },
  "eslintConfig": {
    
    
    "extends": [
      "react-app",
      "react-app/jest"
    ]
  },
  "browserslist": {
    
    //用于告知要支持哪些浏览器（及其版本）。
    "production": [
      ">0.2%",
      "not dead",
      "not op_mini all"
    ],
    "development": [
      "last 1 chrome version",
      "last 1 firefox version",
      "last 1 safari version"
    ]
  },
  "jest": {
    
    
    "roots": [
      "<rootDir>/src"
    ],
    "collectCoverageFrom": [
      "src/**/*.{js,jsx,ts,tsx}",
      "!src/**/*.d.ts"
    ],
    "setupFiles": [
      "react-app-polyfill/jsdom"
    ],
    "setupFilesAfterEnv": [
      "<rootDir>/src/setupTests.js"
    ],
    "testMatch": [
      "<rootDir>/src/**/__tests__/**/*.{js,jsx,ts,tsx}",
      "<rootDir>/src/**/*.{spec,test}.{js,jsx,ts,tsx}"
    ],
    "testEnvironment": "jsdom",
    "testRunner": "D:\\react-study\\node_modules\\jest-circus\\runner.js",
    "transform": {
    
    
      "^.+\\.(js|jsx|mjs|cjs|ts|tsx)$": "<rootDir>/config/jest/babelTransform.js",
      "^.+\\.css$": "<rootDir>/config/jest/cssTransform.js",
      "^(?!.*\\.(js|jsx|mjs|cjs|ts|tsx|css|json)$)": "<rootDir>/config/jest/fileTransform.js"
    },
    "transformIgnorePatterns": [
      "[/\\\\]node_modules[/\\\\].+\\.(js|jsx|mjs|cjs|ts|tsx)$",
      "^.+\\.module\\.(css|sass|scss)$"
    ],
    "modulePaths": [],
    "moduleNameMapper": {
    
    
      "^react-native$": "react-native-web",
      "^.+\\.module\\.(css|sass|scss)$": "identity-obj-proxy"
    },
    "moduleFileExtensions": [
      "web.js",
      "js",
      "web.ts",
      "ts",
      "web.tsx",
      "tsx",
      "json",
      "web.jsx",
      "jsx",
      "node"
    ],
    "watchPlugins": [
      "jest-watch-typeahead/filename",
      "jest-watch-typeahead/testname"
    ],
    "resetMocks": true
  },
  "babel": {
    
    
    "presets": [
      "react-app"
    ]
  },
 "engines": {
    
        //设置了此软件包/应用程序在哪个版本的 Node.js 上运行
    "node": ">= 6.0.0",
    "npm": ">= 3.0.0"
  },
  "devDependencies": {
    
          //作为开发依赖安装的 npm 软件包的列表
    "stylus": "^0.54.8",
    "stylus-loader": "^3.0.2"
  }
}
 author:作者信息

contributors:作者

bugs:链接到

homepage：软件包主页

license：软件包的许可证

keywords：与软件包功能相关的关键字数组

repository:代码仓库

main：入口



--save

--save-dev

bin项用来指定各个内部命令对应的可执行文件的位置。

config：环境变量