Download image in specified folder not in default browser download folder by javascript

I am capturing image on browser and by clicking the Take Snapshot button image gets download in Browser Default Download Folder. But I want to download it in particular path. (I don’t want to change default download path of browser).

I have attached code below.

Webcam.set({
  width: 320,
  height: 240,
  image_format: 'jpeg',
  jpeg_quality: 90
});
Webcam.attach('#my_camera');

var shutter = new Audio();
shutter.autoplay = false;
shutter.src = navigator.userAgent.match(/Firefox/) ? 'webcamjs/shutter.ogg' : 'webcamjs/shutter.mp3';

takeSnapShot = function () {
  Webcam.snap(function (data_uri) {
    downloadImage('Developer', data_uri);
  });
}

downloadImage = function (name, datauri) {
  var a = document.createElement('a');
  a.setAttribute('download', name + '.png');
  a.setAttribute('href', datauri);
  a.click();
}

#my_camera {
  width: 320px;
  height: 240px;
  border: 1px solid black;
}

<div id="my_camera"></div>
<input type="button" value="Take Snapshot" onClick="takeSnapShot()">
<div id="results"></div>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/webcamjs/1.0.25/webcam.js"></script>