Nodejs traverses the folder and counts the file size.

Nodejs traverses the folder and counts the file size.

I have been away from the company for more than two months. I wrote a lot of tools before, but on the day I left the company, I personally formatted all the accumulated tools and code over the past year. Today I think of a problem I encountered in my project. I will record it today.

When I was optimizing the memory, I encountered some images that were difficult to loading during loading. I found some skill icons with a size of 50x50, but the image size was large, several MB, so I found the path and found that when I forgot to compress the output icon, the icon became very large, so the loading was not interrupted.

There are as many as thousands of art files in the project. It is really a kind of physical work to find the problem one by one. At that time, I tried to piece together the API of the nodejs File System to write a small demo, after meeting the requirements, I quickly found the problem and told art to modify the problematic image. This solves the problem.

Statistics on the size of this file is very practical. The front-end can calculate the size of these images for compression. Because there is a data for reference, you can easily find the problem.

The following uses nodejs to traverse the content of the folder file, read all the files, output the files in ascending order of order, and finally generate a file, which has been sorted. Check whether the files have files.

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Var fs = require ('fs ')     // Traverse the folder to obtain the file information in all folders /* * @ Param path * */   Function geFileList (path) { Var filesList = []; ReadFile (path, filesList ); Return filesList; }   // Traverse and read files Function readFile (path, filesList) { Files = fs. readdirSync (path); // synchronous reading is required. Files. forEach (walk ); Function walk (file) { States = fs. statSync (path + '/' + file ); If (states. isDirectory ()) { ReadFile (path + '/' + file, filesList ); } Else { // Create an object to save information Var obj = new Object (); Obj. size = states. size; // file size, in bytes Obj. name = file; // file name Obj. path = path + '/' + file; // absolute file path FilesList. push (obj ); } } }   // Write the file in UTF-8 format Function writeFile (fileName, data) { Fs. writeFile (fileName, data, 'utf-8', complete ); Function complete () { Console. log ("file generated successfully "); } }     Var filesList = geFileList ("G:/nodejs "); FilesList. sort (sortHandler ); Function sortHandler (a, B) { If (a. size> B. size) Return-1; Else if (a. size <B. size) return 1 Return 0; } Var str = ''; For (var I = 0; I <filesList. length; I ++) { Var item = filesList [I]; Var desc = "file name:" + item. name + "" + "Size:" + (item. size/1024). toFixed (2) + "/kb" + "" + "Path:" + item. path; Str + = desc + "\ n" }     WriteFile ("test.txt", str );

The method is simple: Change var filesList = geFileList ("G:/nodejs"); change the getFileList parameter to the desired path, and change the parameter path in it, that is, you can traverse the folder and generate a file.

When the number of files is large, we recommend that you use a powerful text editor to facilitate reading.

Below is the file size