fs.Dirent.isFile()方法是File System模塊內fs.Dirent類的內置應用程序編程接口,用於檢查特定Dirent是否描述了File。
用法:
const dirent.isFile()
參數:此方法不接受任何參數。
返回值:如果特定區別描述了File,則此方法返回true;否則返回false。
以下程序說明了在node.js中使用fs.dirent.isFile()方法:
範例1:
文件名:index.js
// Node.js program to demonstrate the
// dirent.isFile() method
const fs = require('fs');
// Initiating asyn function
async function stop(path) {
// Creating and initiating File's
// underlying resource handle
const dir = await fs.promises.opendir(path);
// Synchronously reading the File's
// underlying resource handle
// using readSync() mehtod
for(var i = 0; i <= 3; i ++ ) {
// Checking if the particular dirent is
// File or not by using isFile() method
const value = (dir.readSync()).isFile();
// 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 } true Dirent { name:'certificate1.cer', [Symbol(type)]:1 } true Dirent { name:'filename.txt', [Symbol(type)]:1 } false Dirent { name:'GFG.java', [Symbol(type)]:1 } true
範例2:
文件名:index.js
// Node.js program to demonstrate the
// dirent.isFile() 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 File's
// underlying resource handle
// using readSync() method
for(var i = 0; i <= 3; i ++ ) {
// Checking if the particular dirent
// is File or not by using isFile() method
const value = (dir.readSync()).isFile();
// 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);
使用以下命令運行index.js文件:
node index.js
輸出:
Dirent { name:'cert.cer', [Symbol(type)]:1 } true Dirent { name:'certificate1.cer', [Symbol(type)]:1 } true Dirent { name:'features', [Symbol(type)]:2 } true Dirent { name:'GFG.class', [Symbol(type)]:1 } true dir is closed successfully
參考: https://nodejs.org/dist/latest-v12.x/docs/api/fs.html#fs_dirent_isfile
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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.isFile() 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。