JavaScriptを使用して画像をblobに変換する方法は？

以下は、JavaScriptを使用して画像をblobに変換するコードです-

例

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result {
      font-size: 18px;
      font-weight: 500;
      color: rebeccapurple;
   }
</style>
</head>
<body>
<h1>Convert an Image to blob using JavaScript</h1>
<div class="sample">
<img src="https://picsum.photos/id/222/300/300.jpg" />
</div>
<button class="Btn">Convert</button>
<div class="result"></div>
<h3>Click on the above button to convert the above image to blob</h3>
<script>
   let BtnEle = document.querySelector(".Btn");
   let resEle = gdocument.querySelector(".result");
   BtnEle.addEventListener("click", () => {
      fetch("https://i.picsum.photos/id/222/300/300.jpg")
      .then(function (response) {
         return response.blob();
      })
      .then(function (blob) {
         resEle.innerHTML = "blob.size = " + blob.size + "<br>";
         resEle.innerHTML += "blob.type = " + blob.type + "<br>";
      });
   });
</script>
</body>
</html>