1 Use node.js library "chokidar"
2 Detail code: 

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var watcher = chokidar.watch("/home/camille/Downloads", {
ignored: /[\/\]./, persistent: true
});
var log = console.log.bind(console);
watcher
.on('add', function(path) { log('File', path, 'has been added'); })
.on('addDir', function(path) { log('Directory', path, 'has been added'); })
.on('change', function(path) { log('File', path, 'has been changed'); })
.on('unlink', function(path) { log('File', path, 'has been removed'); })
.on('unlinkDir', function(path) { log('Directory', path, 'has been removed'); })
.on('error', function(error) { log('Error happened', error); })
.on('ready', function() { log('Initial scan complete. Ready for changes.'); })
.on('raw', function(event, path, details) { log('Raw event info:', event, path, details); })

3 Log: 
File /home/camille/Downloads/dd has been added
File /home/camille/Downloads/Untitled Document has been removed
Raw event info: rename dd { watchedPath: '/home/camille/Downloads' }
Raw event info: rename dddd { watchedPath: '/home/camille/Downloads' }
Raw event info: rename dd { watchedPath: '/home/camille/Downloads/dd' }
File /home/camille/Downloads/dddd has been added
File /home/camille/Downloads/dd has been removed

网站名称：node.js监听文件变化并打印
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