Node.js fs.utimes() 方法

fs.utimes() 方法用于异步更改文件的修改和访问时间戳。可以使用数字、字符串或 Date 对象指定时间戳。如果时间戳无法转换为正确的数字，或者是 NaN、Infinity 或 -Infinity，则会引发错误。

句法：

fs.utimes( path, atime, mtime, callback )

参数：此方法接受上面提到的四个参数，如下所述：

• path：它是一个字符串，表示必须更改其时间戳的文件的路径。
• atime：数字、字符串或日期对象，表示要设置的新访问时间戳。
• mtime：数字、字符串或日期对象，表示要设置的新修改时间戳。
• 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。

以下示例说明了 Node.js 中的fs.utimes() 方法：

示例 1：

// Node.js program to demonstrate the
// fs.utimes() method
  
// Import the filesystem module
const fs = require('fs');
  
console.log("Details before changing time:");
  
// Get the stats object of the file
prevStats = fs.statSync("example_file.txt");
  
// Access the modified and access time of the file
console.log("Modification Time:", prevStats.mtime);
console.log("Access Time:", prevStats.atime);
  
// Get the current time to change the timestamps
let newModifiedTime = new Date();
let newAccessTime = new Date();
  
// Use the utimes() function to assign
// the new timestamps
fs.utimes(
  "example_file.txt",
  newAccessTime,
  newModifiedTime,
  () => {
    // Get the stats object of the file
    console.log("\nDetails after changing time:");
  
    // Get the stats object of the file
    changedStats = fs.statSync("example_file.txt");
  
    // Access the changed modified and
    // access time of the file
    console.log("Changed Modification Time:",
                         changedStats.mtime);
  
    console.log("Changed Access Time:", 
                        changedStats.atime);
  }
);

输出：

Details before changing time:
Modification Time: 2017-01-24T23:41:00.000Z
Access Time: 2018-02-26T00:05:00.000Z

Details after changing time:
Changed Modification Time: 2020-05-25T15:31:08.257Z
Changed Access Time: 2020-05-25T15:31:08.257Z

示例 2：

// Node.js program to demonstrate the
// fs.utimes() method
  
// Import the filesystem module
const fs = require('fs');
  
console.log("Details before changing time:");
  
// Get the stats object of the file
prevStats = fs.statSync("example_file.txt");
  
// Access the modified and access time of the file
console.log("Modification Time:", prevStats.mtime);
console.log("Access Time:", prevStats.atime);
  
// Get the current time to change the timestamps
let newModifiedTime = new Date("January 25, 2017 05:11:00");
let newAccessTime = new Date("February 26, 2018 05:35:00");
  
// Use the utimes() function to assign
// the new timestamps
fs.utimes("example_file.txt", newAccessTime,
                       newModifiedTime, () => {
  
  // Get the stats object of the file
  console.log("\nDetails after changing time:");
  
  // Get the stats object of the file
  changedStats = fs.statSync("example_file.txt");
  
  // Access the changed modified and
  // access time of the file
  console.log("Changed Modification Time:",
                        changedStats.mtime);
  console.log("Changed Access Time:",
                        changedStats.atime);
});

输出：

Details before changing time:
Modification Time: 2015-12-20T19:42:00.000Z
Access Time: 2020-05-25T15:19:24.250Z

Details after changing time:
Changed Modification Time: 2017-01-24T23:41:00.000Z
Changed Access Time: 2018-02-26T00:05:00.000Z

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