nodejs delete files synchronously

Node.js is a very powerful back-end programming language that can help developers easily develop network applications and server-side programs. The file system is an essential part of every server program. It allows us to read, write and delete files, helping us manage our application data more effectively. In this article, we will explain how to delete files synchronously using Node.js.

In Node.js, we can use the "fs" module to read, write and delete files. This module provides a number of different APIs for performing various file operations. However, the most common operation to delete files is using the "fs.unlinkSync()" function. This function is used to delete files synchronously, so we can ensure that the deletion completes before the file is read or written. The following is a sample code to delete a file:

const fs = require('fs');

// 定义要删除的文件路径
const filePath = './file.txt';

try {
  // 使用fs.unlinkSync()函数同步删除文件
  fs.unlinkSync(filePath);
  console.log('文件删除成功');
} catch (err) {
  console.error(err);
}

In the above code, we introduced the "fs" module of Node.js and defined the path of the file to be deleted. Then, we use the "fs.unlinkSync()" function to delete the file synchronously. If the deletion is successful, we will see the "File Deletion Successful" message output on the console. Otherwise, we will catch any errors and print them to the console.

When using the "fs.unlinkSync()" function to delete files, you need to pay attention to the following points:

1. When deleting files, you need to ensure that the file path is correct. If the file does not exist, we will receive an error.
2. When deleting a file, you need to ensure that the file is not occupied by other code. Otherwise, we may receive an "EBUSY" error. Therefore, it's a good idea to close any open file streams or read the file in other code before performing a delete operation.

If you need to delete multiple files, you can use a loop and perform the delete operation for each file in it. The following is a sample code to delete multiple files:

const fs = require('fs');

const fileNames = ['file1.txt', 'file2.txt', 'file3.txt'];

// 遍历文件名列表
fileNames.forEach((fileName) => {
  const filePath = `./${fileName}`;
  
  try {
    // 删除每个文件
    fs.unlinkSync(filePath);
    console.log(`${fileName} 删除成功`);
  } catch (err) {
    console.error(`删除 ${fileName} 失败: `, err);
  }
});

In this sample code, we first define a list of file names, and then use the "forEach()" function to iterate through the list. For each filename, we build the path to the file and delete the file using the "fs.unlinkSync()" function. If the deletion is successful, we will print a success message on the console, otherwise we will catch any errors and print them on the console.

Summary

In Node.js, deleting files synchronously is very simple. We only need to use the "fs.unlinkSync()" function and specify the path of the file to be deleted. If you need to delete multiple files, you can use a loop to iterate through the list of files and perform the delete operations within them. However, please note that when deleting a file you need to ensure that the file path is correct, that the file is not occupied by other code, and that any errors need to be caught and printed to the console.

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