Node.js fs。Dirent.isFile()方法
原文:https://www . geesforgeks . org/node-js-fs-dirent-is file-method/
fs。Dirent.isFile() 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文件。
语法:
const dirent.isFile()
参数:此方法不接受任何参数。 返回值:如果特定方向描述文件，则该方法返回真，否则返回假。 下面的程序说明了 fs.dirent.isFile() 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.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() 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);
}
}
// 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 }
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
示例 2: 文件名:index.js
java 描述语言
// 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);
使用以下命令运行 index.js 文件:
node index.js
输出:
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
参考:https://nodejs . org/dist/latest-v1 . x/docs/API/fs . html # fs _ dirent _ isfile
版权属于：月萌API www.moonapi.com，转载请注明出处
