语言►nodejs►库►nodemon

什么是nodemon

本文作者: jsweibo

本文链接: https://jsweibo.github.io/2019/07/30/%E4%BB%80%E4%B9%88%E6%98%AFnodemon/

摘要

本文主要讲述了：

  1. 作用
  2. 安装
  3. 示例

正文

作用

监听项目文件变更并重启 nodejs 应用。

安装

局部安装

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#!/usr/bin/env bash

npm install --save-dev nodemon

示例

learn_nodemon/package.json

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{
  "name": "learn_npm",
  "version": "1.0.0",
  "main": "index.js",
  "devDependencies": {
    "nodemon": "^1.19.2"
  },
  "dependencies": {
    "mime": "^2.4.4"
  }
}

learn_nodemon/nodemon.json

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{
  "watch": ["index.js"]
}

learn_nodemon/index.js

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const http = require('http');
const path = require('path');
const fs = require('fs');
const mime = require('mime');

const server = http.createServer();
const baseURL = 'html';

function get(req, res) {
  const url = new URL(req.url, 'http://localhost');
  const pathname = decodeURIComponent(url.pathname);
  const filepath = path.join(__dirname, baseURL, pathname);
  fs.stat(filepath, function (er, stat) {
    if (er) {
      if (er.code === 'ENOENT') {
        res.statusCode = 404;
        res.end('Not Found');
      } else {
        res.statusCode = 500;
        res.end('Internal Server Error');
      }
    } else {
      res.setHeader('Content-Type', mime.getType(filepath));
      res.setHeader('Content-Length', stat.size);
      const stream = fs.createReadStream(filepath);
      stream.on('error', function () {
        res.statusCode = 500;
        res.end('Internal Server Error');
      });
      stream.pipe(res);
    }
  });
}

server.on('request', function (req, res) {
  switch (req.method) {
    case 'GET':
      get(req, res);
      break;
    case 'POST':
      break;
    default:
      break;
  }
});

const hostname = process.argv[2] || '127.0.0.1';
const port = process.argv[3] || 3000;

server.listen({
  hostname,
  port,
});

console.log(`Server is running at http://${hostname}:${port}`);

运行：

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#!/usr/bin/env bash

npx nodemon index.js

当 CWD 下的index.js变更时，nodemon 会结束原先的 nodejs 进程并执行node index.js。

参考资料

本文作者: jsweibo

本文链接: https://jsweibo.github.io/2019/07/30/%E4%BB%80%E4%B9%88%E6%98%AFnodemon/

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