如何访问 JavaScript 属性?

javascriptweb developmentobject oriented programming更新于 2025/8/25 0:12:17

有三种方法可以访问 JavaScript 属性 −

使用点属性访问:object.property
使用方括号表示法:object[‘property’]
使用对象解构:let {property} = object

以下是访问 JavaScript 对象属性的代码 −

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,
   .sample {
      font-size: 18px;
      font-weight: 500;
      color: blueviolet;
   }
   .sample {
      color: red;
   }
</style>
</head>
<body>
<h1>Access JavaScript object properties</h1>
<div><pre class="sample">{a:22,b:44}</pre></div>
<div class="result"></div>
<button class="Btn">Access</button>
<h3>Click on the above button to access object properites</h3>
<script>
   let resEle = document.querySelector(".result");
   let BtnEle = document.querySelector(".Btn");
   let obj = { a: 22, b: 44 };
   BtnEle.addEventListener("click", () => {
      resEle.innerHTML += "obj.a = " + obj.a + "<br>";
      resEle.innerHTML += "obj['a'] = " + obj["a"] + "<br>";
      let { a } = obj;
      resEle.innerHTML += "{a}=obj = " + a + "<br>";
   });
</script>
</body>
</html>