2つのJavaScriptオブジェクトをマージする方法は？

以下は、2つのJavaScriptオブジェクトをマージするコードです-

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>Merge two JavaScript objects</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>
Click the above button to merge person and adress object together.
</h3>
<script>
   let BtnEle = document.querySelector(".Btn");
   let resEle = document.querySelector(".result");
   let person = {
      name: "Rohan",
      age: 22,
   };
   let address = {
      state: "Delhi",
      country: "India",
   };
   let mergedObj = { ...person, ...address };
   BtnEle.addEventListener("click", () => {
      for (let i in mergedObj) {
         resEle.innerHTML += "Key = " + i + " : Value = " + mergedObj[i] + "<br>";
      }
   });
</script>
</body>
</html>