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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript Object.defineProperty()</h1>
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<p>本例使用 defineProperty() 方法添加 getter 和 setter。</p>
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<p id="demo"></p>
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<script>
// 创建对象：
const person = {firstName:"Bill", lastName:"Gates"};
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// 定义 getter
Object.defineProperty(person, "fullName", {
  get: function () {return this.firstName + " " + this.lastName;}
});
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// 显示全名
document.getElementById("demo").innerHTML = person.fullName;
</script>
​
</body>
</html>
​