解釋 JavaScript 中物件相等性。

在 JavaScript 中，字串、數字、布林值等基礎資料型別會按其值進行比較，而物件（原生或自定義）則按其引用進行比較。按引用比較是指兩個或多個物件是否指向記憶體中的同一位置。

以下程式碼可說明 JavaScript 中物件的相等性：-

示例

<!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>Equality of objects in JavaScript</h1>
<div class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>Click the above button to compare objects</h3>
<script>
   let BtnEle = document.querySelector(".Btn");
   let resEle = document.querySelector(".result");
   let obj = {
      name: "Rohan",
      age: 21,
   };
   let obj1 = {
      name: "Rohan",
      age: 21,
   };
   let obj2 = obj;
   BtnEle.addEventListener("click", () => {
      if (obj != obj1) {
         resEle.innerHTML = "obj is not equal to obj1 <br>";
      }
      if (obj2 === obj) {
         resEle.innerHTML += "obj2 is equal to obj";
      }
   });
</script>
</body>
</html>