Node.js fsPromises.rename()方法
原文:https://www . geesforgeks . org/node-js-fs promises-rename-method/
fsPromises.rename() 方法用于将给定旧路径的文件异步重命名为给定新路径。如果目标文件已经存在，它将覆盖该文件。它解决了承诺，成功后没有争论。
语法:
fsPromises.rename( oldPath, newPath )
参数:该方法接受两个参数，如上所述，如下所述:
- [Old path]: Save the file path to be renamed. It can be a string, a buffer or a web address.
- New Path: A new path that needs to be renamed to save the file. It can be a string, a buffer or a web address.
下面的例子说明了 Node.js 中的 fsPromises.rename() 方法:
示例 1: 本示例使用 fsPromises.rename() 方法重命名文件:
Node.js
// Node.js program to demonstrate the
// fsPromises.rename() method
// Import filesystem module
const fs = require('fs');
const fsPromises = require('fs').promises;
// List all the filenames before renaming
getCurrentFilenames();
(async function main() {
try {
// Rename the file
fsPromises.rename('GFG.txt', 'GeeksforGeeks.txt')
console.log("\nFile Renamed!\n");
// List all the filenames after renaming
getCurrentFilenames();
} catch (err) {
console.error(err);
}
})();
// Function to get current filenames
// in directory
function getCurrentFilenames() {
console.log("Current filenames:");
fs.readdirSync(__dirname).forEach(file => {
console.log(file);
});
}
输出:
Current filenames:
GFG.txt
GeeksforGeeks.js
File Renamed!
Current filenames:
GeeksforGeeks.js
GFG.txt
示例 2: 本示例使用 fsPromises.rename() 方法演示文件重命名过程中出现的错误:
node . js
// Node.js program to demonstrate the
// fsPromises.rename() method
// Import filesystem module
const fs = require('fs');
const fsPromises = require('fs').promises;
(async function main() {
try {
// List all the filenames before renaming
getCurrentFilenames();
// Rename the file
fsPromises.rename('GeeksforGeeks.txt', 'geeks.txt')
// List all the filenames after renaming
console.log("\nFile Renamed\n");
// List all the filenames after renaming
getCurrentFilenames();
}
catch (err) {
console.error(err);
}
})();
// Function to get current filenames
// in directory
function getCurrentFilenames() {
console.log("Current filenames:");
fs.readdirSync(__dirname).forEach(file => {
console.log(file);
});
}
输出:
Current filenames:
index.js
package.json
world.txt
[Error: ENOENT: no such file or directory, rename
'G:\tutorials\nodejs-fs-rename\GeeksforGeeks.txt' ->
'G:\tutorials\nodejs-fs-rename\geeks.txt'] {
errno: -4058,
code: 'ENOENT',
syscall: 'rename',
path: 'G:\\tutorials\\nodejs-fs-rename\\GeeksforGeeks.txt',
dest: 'G:\\tutorials\\nodejs-fs-rename\\geeks.txt'
}
参考:https://nodejs . org/API/fs . html # fs _ fspromises _ rename _ old path _ new path
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