Detailed explanation of how node.js determines whether a file exists and deletes it

This article mainly introduces the method of nodejs to determine the existence and deletion of files and folders. You need to use the fs module of nodejs. It analyzes the operation skills of nodejs based on the file module to determine the existence and deletion of files and folders based on the example form. Friends in need can refer to it, I hope it can help everyone.

Judge whether files and folders exist

You need to use the fs module of nodejs

Introduce

var fs= require("fs")

How to judge

fs.exists(path, callback)

path: The path of the determined folder and file
callback: callback function

fs.exists("dirName", function(exists) {
  console.log(exists ? "创建成功" : "创建失败");
});

Delete the folder and file

The fs module of node.js only provides the function of deleting the file unlink folder and the directory rmdir, so deleting them together requires us to traverse the deletion. The code is as follows

var fs = require('fs'); // 引入fs模块
function deleteall(path) {
  var files = [];
  if(fs.existsSync(path)) {
    files = fs.readdirSync(path);
    files.forEach(function(file, index) {
      var curPath = path + "/" + file;
      if(fs.statSync(curPath).isDirectory()) { // recurse
        deleteall(curPath);
      } else { // delete file
        fs.unlinkSync(curPath);
      }
    });
    fs.rmdirSync(path);
  }
};

Use

deleteall("./dir")//将文件夹传入即可

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