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how I Will use my file and make such manipulation (search, insert, delete) lintrieur in my file

i used this functions to upload my file ::: javascript <!DOCTYPE html>

<html> <head> <title></title> </head>


<input type =file id= 'openFile' /> <hr> <pre id = 'fileContents'></pre> <script type="text/javascript" > document.getElementById('openFile').addEventListener('change', function() { var fr = new FileReader(); fr.onload = function () { document.getElementById('fileContents').textContent = this.result; } fr.readAsText(this.files[0]); });

var monfichier=fileSystem.OpenTextFile("input.txt", 2 ,true); monfichier.WriteLine("tutoriels en folie"); monfichier=fileSystem.OpenTextFile("input.txt", 1 ,true); alert(monfichier.ReadAll()); // imprime: "tutoriels en folie" monFichier.Close(); </script> </body> </html>

;;; but i dont know how manipulate (search, insert, delete) lintrieur in my file