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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript Getter 和 Setter</h1>
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<p>Getter 和 Setter 允许您通过方法获取和设置属性。</p>
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<p>此例具有修改的 setter 以保护语言的大写更新。</p>
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<p id="demo"></p>
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<script>
// Create an object:
var person = {
  firstName: "John",
  lastName : "Doe",
  language : "",
  set lang(value) {
     this.language = value.toUpperCase();
  }
};
// Set an object property using a setter:
person.lang = "en";
// Display data from the object:
document.getElementById("demo").innerHTML = person.language;
</script>
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</body>
</html>
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