Node.js fs-extra emptyDirSync()函数
原文:https://www . geesforgeks . org/node-js-fs-extra-emptydirsync-function/
emptyDirSync() 功能是 emptyDir() 功能的同步版本。该函数确保给定的目录为空。如果目录不为空,它将删除该目录中的所有内容。目录本身不会被删除。如果目录不存在,它将由函数本身创建。
语法:
fs.emptyDirSync(dir)
// OR
fs.emptydirSync(dir)
参数:该函数接受以下参数:
- dir: 是包含目录路径的字符串。
返回值:函数不返回任何内容。
按照步骤实现功能:
步骤 1: 可以使用以下命令安装模块:
npm install fs-extra
步骤 2: 安装模块后,您可以使用以下命令检查已安装模块的版本:
npm ls fs-extra
步骤 3: 使用以下命令创建一个名为 index.js 的文件,并在文件中要求 fs-extra 模块:
const fs = require('fs-extra');
步骤 4: 要运行文件,在终端中写入以下命令:
node index.js
项目结构:项目结构会是这样的。
例 1:
文件名:index.js
java 描述语言
// Requiring module
const fs = require("fs-extra");
// Function to calculate number of files in directory
const numberOfFiles = (dir) => {
const noOfFiles = fs.readdirSync(dir);
return noOfFiles.length;
};
// Directory path
// This directory have 2 files in it
const dir = "dir";
// Number of files before calling the function
const before = numberOfFiles(dir);
console.log(
`Number of files in directory before calling the function: ${before}`
);
// Function call
fs.emptyDirSync(dir);
// Number of files after calling the function
const after = numberOfFiles(dir);
console.log(`Number of files in directory after`+
` calling the function: ${after}`);
console.log("Directory is empty now");
使用以下命令运行 index.js 文件:
node index.js
输出:
Number of files in directory before calling the function: 2
Number of files in directory after calling the function: 0
Directory is empty now
例 2:
文件名:index.js
java 描述语言
// Requiring module
const fs = require("fs-extra");
// Function to calculate number of files in directory
const numberOfFiles = (dir) => {
const noOfFiles = fs.readdirSync(dir);
return noOfFiles.length;
};
// Directory path
// This directory has only 1 file
const dir = "dir/direc";
// Number of files before calling the function
const before = numberOfFiles(dir);
console.log(
`Number of files in directory before calling the function: ${before}`
);
// Function call
fs.emptyDirSync(dir);
// Number of files after calling the function
const after = numberOfFiles(dir);
console.log(`Number of files in directory after`+
` calling the function: ${after}`);
console.log("Directory is empty now");
使用以下命令运行 index.js 文件:
node index.js
输出:
Number of files in directory before calling the function: 1
Number of files in directory after calling the function: 0
Directory is empty now
参考:https://github . com/jprichardson/node-fs-extra/blob/HEAD/docs/emptyDir-sync . MD
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