JavaScript 中的键控集合

javascriptweb developmentobject oriented programming更新于 2025/9/2 13:32:17

键控集合是按键而非索引排序的数据集合。它们本质上是关联的。Map 和 set 对象是键控集合，可按插入顺序进行迭代。

以下是 JavaScript 中键控集合的代码 −

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: 20px;
      font-weight: 500;
      color: blueviolet;
   }
</style>
</head>
<body>
<h1>Keyed collections in JavaScript</h1>
<div class="result"></div>
<br />
<button class="btn">点击此处</button>
<h3>Click on the above button to create and display the object</h3>
<script>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   BtnEle.addEventListener("click", () => {
      let obj = {
         name:'Rohan',
         age:22,
         occupation:'Student',
      };
      for(i in obj){
         resEle.innerHTML += `key = ${i} : value = ${obj[i]} <br>`;
      }
   });
</script>
</body>
</html>