cordova Javascript require（'fs'）正在停止我的代码

Question

I've been working on a mobile app in Visual Studio 2017, I need to do some file access but have struggled for the last week. what i have is:

function findCampaignFolders() {
    alert("in find folder");
    var fs = require('fs');
    alert("finally past file system");
    var Folders = fs.readdirSync("/Campagins");
    var textString = "";
    for (var i = 0; i < Folders.length; i++)
    {
        textString = textString + Folders[i];
    }
    alert(textString);
}

when this function is called alert("in find folder"); works and sends it promt.

but alert("finally past file system"); never fires or anything after.

the cordova is predicted with fs.readdirSync () so it recognized in the VS2017.

as for scripts load order in looks like in HTML file:

<script type="text/javascript" src="cordova.js"></script>
<script type="text/javascript" src="scripts/platformOverrides.js"></script>
<script type="text/javascript" src="scripts/Objects.js"></script> 

Objects.js is where my function lives.

If anyone can at least give me a hint as why i can't get this working or if there is another way i can go about it it would be a great help.

Answer 1

var fs = require('fs'); is Node.js code that doesn't work on Cordova apps. Node.js code is meant to be used on a server or on CLI apps, but not in client apps such as Cordova.

To read/write files in Cordova you have to use cordova-plugin-file https://github.com/apache/cordova-plugin-file