JavaScript 对象访问器

javascriptweb developmentobject oriented programming更新于 2025/12/13 10:20:17

getter 和 setter 关键字用于访问对象。访问属性时使用 getter 返回值，setter 接受参数并将对象内的属性值设置为传递的参数。

以下是 JavaScript 中访问对象的代码 −

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;
   }
   .sample {
      font-size: 18px;
      font-weight: 500;
      color: red;
   }
</style>
</head>
<body>
<h1>JavaScript Object Accessors</h1>
Enter a number <input class="num" type="number" />
<div class="sample"></div>
<button class="btn">点击此处</button>
<h3>
Click on the above button to set the age value and display it
</h3>
<script>
   let sampleEle = document.querySelector(".sample");
   let testObj = {
      age: "",
      set AGE(val) {
         this.age = val;
      },
      get AGE() {
         return this.age;
      },
   };
   document.querySelector(".Btn").addEventListener("click", () => {
      let number = document.querySelector(".num").value;
      testObj.AGE = number;
      sampleEle.innerHTML = "AGE = " + testObj.AGE;
   });
</script>
</body>
</html>