fs.Dirent.isCharacterDevice()方法是文件係統模塊中類fs.Dirent的內置應用程序編程接口,用於檢查特定Dirent是否描述了字符設備。
用法:
const dirent.isCharacterDevice()
參數:此方法不接受任何參數。
返回值:如果特定字符描述字符設備,則此方法返回true,否則返回false。
以下程序說明了Node.js中fs.dirent.isCharacterDevice()方法的使用:
範例1:
文件名:index.js
// Node program to demonstrate the
// dirent.isCharacterDevice() method
const fs = require('fs');
// Intiating 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 Character device or not by using
// isCharacterDevice() method
const value = (dir.readSync())
.isCharacterDevice();
// Display the result
console.log(dir.readSync());
console.log(value);
}
}
// Catching error
stop('./').catch(console.error);
使用以下命令運行index.js文件:
node index.js
輸出:
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
範例2:
文件名:index.js
// Node program to demonstrate the
// dirent.isCharacterDevice() method
const fs = require('fs');
// Intiating asyn function
async function stop(path) {
// Creating and initiating directory's
// underlying resource handle
const dir = await fs.promises
.opendir(new URL('file:///F:/'));
// Synchronously reading the directory's
// underlying resource handle using
// readSync() mehtod
for (var i = 0; i <= 3; i++) {
// Checking if the particular dirent
// is Character device or not by
// using isCharacterDevice() method
const value = (dir.readSync())
.isCharacterDevice();
// Display the result
console.log(dir.readSync());
console.log(value);
}
}
// Catching error
stop('./').catch(console.error);
使用以下命令運行index.js文件:
node index.js
輸出:
Dirent { name:'adonis_auth_api', [Symbol(type)]:2 } false Dirent { name:'Android Template', [Symbol(type)]:2 } false Dirent { name:'Calander', [Symbol(type)]:2 } false Dirent { name:'first-app', [Symbol(type)]:2 } false
參考: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_dirent_ischaracterdevice
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注:本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js fs.Dirent.isCharacterDevice() 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。