安装依赖

npm i chokidar

创建启动文件

//index.js
const chokidar = require('chokidar'), {spawn} = require('child_process');
//要启动和监听的目标文件
const targetFile = 'main.js'function debounce(fn, delay) {var id;return function() {clearTimeout(id);id = setTimeout(function(){fn()}, delay)}
}var childProcess;
function start() {childProcess && childProcess.kill();console.log('start again');childProcess = spawn('node', [targetFile], {stdio:[process.stdin, process.stdout, process.stderr]})
}chokidar.watch(targetFile).on('all', function(evt, path){console.log(evt, path);debounce(start, 500)()
})

创建被监听页面

//main.js
const {createServer} = require('http'), url = require('url')
//创建一个服务器，监听8000端口
createServer(function(req, res){try {const pathname = url.parse(req.url).pathname;console.log('pathname: ', pathname, ['/', '/index'].includes(pathname));res.writeHead(200, {'Content-Type': 'text/html;charset=utf-8;'});var resContent = 'index.html'pathname && ['/', '/index'].includes(pathname) && (resContent = 'hello node')res.write(resContent)res.end()} catch (error) {console.error(error);}
}).listen(8000)console.log(`http server is listening 0.0.0.0:8000`);