JavaScript 中的索引集合

数组是 JavaScript 中的索引集合，因为它们允许我们使用其索引访问元素。

以下是 JavaScript 中实现索引集合的代码 -

案例

<!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: 20px;
      font-weight: 500;
      color: blueviolet;
   }
</style>
</head>
<body>
<h1>Indexed collections in JavaScript</h1>
<div class="result"></div>
<br />
<button class="Btn">CLICK HERE</button>
<h3>Click on the above button to create and display the array</h3>
<script>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   BtnEle.addEventListener("click", () => {
      let arr = [1, 2, 3, 4, 5];
      arr.forEach((item, index) => {
         resEle.innerHTML += `arr[${index}] = ${item} <br>`;
      });
   });
</script>
</body>
</html>