Node.js fs.utimes()用法及代碼示例

fs.utimes()方法用於異步更改文件的修改和訪問時間戳。可以使用數字，字符串或Date對象指定時間戳。如果時間戳不能轉換為正確的數字，或者是NaN，Infinity或-Infinity，則將引發錯誤。

用法:

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

參數：此方法接受上述和以下所述的四個參數：

path:它是一個字符串，表示必須更改其時間戳的文件的路徑。
atime:它是數字，字符串或Date對象，表示要設置的新訪問時間戳。
mtime:是數字，字符串或Date對象，表示要設置的新修改時間戳。
callback:該方法執行時將調用該函數。
- err:如果方法失敗，將引發錯誤。

以下示例說明了Node.js中的fs.utimes()方法：

範例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); 
  } 
);

輸出：

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

範例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); 
});

輸出：

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

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

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注：本文由純淨天空篩選整理自sayantanm19大神的英文原創作品 Node.js | fs.utimes() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。