Node.js fs.unlink() 方法

fs.unlink() 方法用于从文件系统中删除文件或符号链接。此函数不适用于目录，因此建议使用 fs.rmdir() 删除目录。
句法：

fs.unlink( path, callback )

参数：此方法接受上面提到的两个参数，如下所述：

• 路径：它是一个字符串、缓冲区或 URL，表示必须删除的文件或符号链接。
• 回调：它是一个在方法执行时将被调用的函数。
• err：如果方法失败会抛出一个错误。

下面的示例说明了 Node.js 中的fs.unlink() 方法：
示例 1：此示例从文件系统中删除一个文件。

javascript

// Node.js program to demonstrate the
// fs.unlink() method
  
// Import the filesystem module
const fs = require('fs');
  
// Get the files in current directory
// before deletion
getFilesInDirectory();
  
// Delete example_file.txt
fs.unlink("example_file.txt", (err => {
  if (err) console.log(err);
  else {
    console.log("\nDeleted file: example_file.txt");
  
    // Get the files in current directory
    // after deletion
    getFilesInDirectory();
  }
}));
  
// Function to get current filenames
// in directory with specific extension
function getFilesInDirectory() {
  console.log("\nFiles present in directory:");
  let files = fs.readdirSync(__dirname);
  files.forEach(file => {
    console.log(file);
  });
}

输出：

Files present in directory:
example_file.txt
index.js
package.json

Deleted file: example_file.txt

Files present in directory:
index.js
package.json

示例 2：此示例从文件系统中删除符号链接。

javascript

// Node.js program to demonstrate the
// fs.unlink() method
  
// Import the filesystem module
const fs = require('fs');
  
// Creating symlink to file
fs.symlinkSync(__dirname + "\\example_file.txt", "symlinkToFile");
console.log("\nSymbolic link to example_file.txt created");
  
// Function to get current filenames
// in directory with specific extension
getFilesInDirectory();
  
// Deleting symbolic link to example_file.txt
// Delete example_file.txt
fs.unlink("symlinkToFile", (err => {
  if (err) console.log(err);
  else {
    console.log("\nDeleted Symbolic Link: symlinkToFile");
  
    // Get the files in current directory
    // after deletion
    getFilesInDirectory();
  }
}));
  
// Function to get current filenames
// in directory with specific extension
function getFilesInDirectory() {
  console.log("\nFiles present in directory:");
  let files = fs.readdirSync(__dirname);
  files.forEach(file => {
    console.log(file);
  });
}

输出：

Symbolic link to example_file.txt created

Files present in directory:
example_file.txt
index.js
package.json
symlinkToFile

Deleted Symbolic Link: symlinkToFile

Files present in directory:
example_file.txt
index.js
package.json

参考： https://nodejs.org/api/fs.html#fs_fs_unlink_path_callback