Node.js fs.link()方法
fs.link()方法用于创建到给定路径的硬链接。创建的硬链接仍然指向同一个文件，即使该文件被重命名。硬链接还包含链接文件的实际内容。
语法:
fs.link( existingPath, newPath, callback )
参数:该方法接受三个参数，如上所述，如下所述:
- Existing path: It is a string, buffer or web address, which indicates the file to which the symbolic link must be created.
- New path: It is a string, buffer or web address, which represents the file path where the symbolic link will be created.
- Callback: is a function that will be called when the method is executed.
- err: If the method fails, this error will be thrown.
下面的例子说明了 Node.js 中的 fs.link()方法:
示例 1: 本示例创建到文件的硬链接。
// Node.js program to demonstrate the
// fs.link() method
// Import the filesystem module
const fs = require('fs');
console.log("Contents of the text file:");
console.log(fs.readFileSync('example_file.txt', 'utf8'));
fs.link(__dirname + "\\example_file.txt", "hardlinkToFile", (err) => {
if (err) console.log(err)
else {
console.log("\nHard link created\n");
console.log("Contents of the hard link created:");
console.log(fs.readFileSync('hardlinkToFile', 'utf8'));
}
});
输出:
Contents of the text file:
This is an example of the fs.link() method.
Hard link created
Contents of the hard created:
This is an example of the fs.link() method.
示例 2: 本示例创建文件的硬链接，并删除原始文件。原始文件的内容仍然可以通过硬链接访问。
// Node.js program to demonstrate the
// fs.link() method
// Import the filesystem module
const fs = require('fs');
console.log("Contents of the text file:");
console.log(fs.readFileSync('example_file.txt', 'utf8'));
fs.link(__dirname + "\\example_file.txt", "hardlinkToFile", (err) => {
if (err) console.log(err)
else {
console.log("\nHard link created\n");
console.log("Contents of the hard link created:");
console.log(fs.readFileSync('hardlinkToFile', 'utf8'));
console.log("\nDeleting the original file");
fs.unlinkSync("example_file.txt");
console.log("\nContents of the hard link created:");
console.log(fs.readFileSync('hardlinkToFile', 'utf8'));
}
});
输出:
Contents of the text file:
This is an example of the fs.link() method.
Hard link created
Contents of the hard link created:
This is an example of the fs.link() method.
Deleting the original file
Contents of the hard link created:
This is an example of the fs.link() method.
参考:T2【https://nodejs . org/API/fs . html # fs _ fs _ link _ existing path _ new path _ callback
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