Node.js fs。Dirent.isSymbolicLink()方法

原文:https://www . geesforgeks . org/node-js-fs-dirent-issymboliclin-method/

fs。方法是类 fs 的内置应用编程接口。文件系统模块中的目录，用于检查特定目录是否描述了符号链接。

语法:

const dirent.isSymbolicLink()

参数:此方法不接受任何参数。 返回值:如果特定方向描述了一个符号，则该方法返回真，否则返回假。 下面的程序说明了fs . dirent . issymboliclin()方法在 Node.js: 中的使用示例 1: 文件名:index.js

java 描述语言

// Node.js program to demonstrate the
// dirent.isSymbolicLink() method
const fs = require('fs');

// Initiating asyn function
async function stop(path) {

  // Creating and initiating dir's
  // underlying resource handle
  const dir = await fs.promises.opendir(path);

  // Synchronously reading the dir's
  // underlying resource handle
  // using readSync() method
  for(var i = 0; i <= 3; i ++ ) {

    // Checking if the particular dirent
    // is SymbolicLink or not by using
    // isSymbolicLink() method
    const value = (dir.readSync()).isSymbolicLink();

    // 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 }
false
Dirent { name: 'GFG.java', [Symbol(type)]: 1 }
false

示例 2: 文件名:index.js

java 描述语言

// Node.js program to demonstrate the
// dirent.isSymbolicLink() 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/'));

    // Synchronously reading the dir's
    // underlying resource handle
    // using readSync() method
    for(var i = 0; i <= 3; i ++ ) {

      // Checking if the particular dirent
      // is SymbolicLink or not by using
      // isSymbolicLink() method
      const value = (dir.readSync()).isSymbolicLink();

      // 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);

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:T2【https://nodejs . org/dist/latest-v 12 . x/docs/API/fs . html # fs _ dirent _ issymboleling

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