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canvas-to-gif.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Creatig a GIF using JavaScript</title>
</head>
<body>
<script type="text/javascript" src="LZWEncoder.js"></script>
<script type="text/javascript" src="NeuQuant.js"></script>
<script type="text/javascript" src="GIFEncoder.js"></script>
<script type="text/javascript" src="b64.js"></script>
<canvas id="canvas1" width="100" height="100"></canvas>
<canvas id="canvas2" width="100" height="100"></canvas>
<canvas id="canvas3" width="100" height="100"></canvas>
<div id="container"></div>
<script>
const canvas1 = document.getElementById('canvas1');
const context1 = canvas1.getContext('2d');
context1.fillStyle = "red";
context1.fillRect(0, 0, 100, 100);
const canvas2 = document.getElementById('canvas2');
const context2 = canvas2.getContext('2d');
context2.fillStyle = "green";
context2.fillRect(0, 0, 100, 100);
const canvas3 = document.getElementById('canvas3');
const context3 = canvas3.getContext('2d');
context3.fillStyle = "blue";
context3.fillRect(0, 0, 100, 100);
let encoder = new GIFEncoder();
encoder.setRepeat(0);
encoder.setDelay(500);
encoder.start();
encoder.addFrame(context1);
encoder.addFrame(context2);
encoder.addFrame(context3);
encoder.finish();
let binaryData = encoder.stream().getData();
let dataUrl = 'data:image/gif;base64,'+encode64(binaryData);
const image = document.createElement("img");
image.src = dataUrl;
document.getElementById('container').appendChild(image);
</script>
</body>
</html>