Code implementation of file monitoring in Node.js file system

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Listening file

fs.watchFile()

fs.watchFileSync()

fs.watch

FSWatcher class

// 导入模块
const fs = require('fs');

// 监听文件的变化
//curr当前的修改的状态，prev上一次文件修改的状态
// interval:1000每隔一段时间检测文件变化
fs.watchFile('../fs/zhang.txt', {interval: 1000}, function (curr, prev) {
    console.log('当前文件的修改时间:' + curr.mtime + '当前文件的大小:' + curr.size);
    console.log("上一次的文件修改时间:" + prev.mtime + '上一次文件的大小:' + prev.size);

    // 停止监听
    fs.unwatchFile('../fs/zhang.txt');
});

// 使用watch监听文件变化
// eventType事件类型，filename变化的文件名
fs.watch('../fs/2.txt', function (eventType, filename) {
    console.log(eventType, filename);//输出rename 2.txt
});

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