Node.js fs.Dirent.isDirectory()用法及代码示例

fs.Dirent.isDirectory()方法是文件系统模块中类fs.Dirent的内置应用程序编程接口，用于检查特定Dirent是否描述了目录。

用法:

const dirent.isDirectory()

参数：此方法不接受任何参数。

返回值：如果特定目录描述Directory，则此方法返回true，否则返回false。

以下程序说明了Node.js中fs.dirent.isDirectory()方法的使用：

范例1：
文件名：index.js

// Node.js program to demonstrate the  
// dirent.isDirectory() method 
const fs = require('fs'); 
  
// Initiating asyn function 
async function stop(path) { 
  
  // Creating and initiating directory's 
  // underlying resource handle 
  const dir = await fs.promises.opendir(path); 
    
  // Synchronously reading the directory's 
  // underlying resource handle using  
  // readSync() mehtod 
  for(var i = 0 ; i <= 3 ; i ++ ) { 
  
    // Checking if the particular dirent 
    // is Directory or not by using 
    // isDirectory() method 
    const value = (dir.readSync()).isDirectory(); 
  
    // Display the result 
    console.log(dir.readSync()); 
    console.log(value); 
  } 
} 
  
// Catching error 
stop('./').catch(console.error);

使用以下命令运行index.js文件：

node index.js

输出：

Dirent { name:'cert.cer', [Symbol(type)]:1 }
false
Dirent { name:'certificate1.cer', [Symbol(type)]:1 }
false
Dirent { name:'filename.txt', [Symbol(type)]:1 }
true
Dirent { name:'GFG.java', [Symbol(type)]:1 }
false

范例2：
文件名：index.js

// node.js program to demonstrate the  
// dirent.isDirectory() method 
const fs = require('fs'); 
    
// Initiating asyn function 
async function stop(path) { 
   
  let dir = null; 
    
  try { 
  
  // Creating and initiating directory's 
  // underlying resource handle 
  dir = await fs.promises.opendir( 
        new URL('file:///F:/java/')); 
  
  // Using readSync() mehtod 
  for(var i = 0 ; i <= 3 ; i ++ ) { 
  
    // Checking if the particular dirent 
    // is Directory or not by using  
    // isDirectory() method 
    const value = (dir.readSync()).isDirectory(); 
    
    // Display the result 
    console.log(dir.readSync()); 
    console.log(value); 
  } 
  
  } finally { 
   
    if (dir) { 
  
      // Display the result 
      console.log("dir is closed successfully"); 
  
      // Synchronously closeSyncing the directory's 
      // underlying resource handle 
      const promise = dir.closeSync(); 
    } 
  } 
} 
    
// Catching error 
stop('./').catch(console.error);

使用以下命令运行index.js文件：

node index.js

输出：

Dirent { name:'cert.cer', [Symbol(type)]:1 }
false
Dirent { name:'certificate1.cer', [Symbol(type)]:1 }
false
Dirent { name:'features', [Symbol(type)]:2 }
false
Dirent { name:'GFG.class', [Symbol(type)]:1 }
false
dir is closed successfully

参考： https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_dirent_isdirectory

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Node.js fs.Dirent.isDirectory() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。