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<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript ES5 对象添加属性</h1>
​
<p>可以通过 Object.defineProperty(object, property, {value : value}) 方法新增属性</p>
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<p id="demo"></p>
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<script>
// 创建对象
const person = {
  firstName: "Bill",
  lastName : "Gates",
  language : "EN"
};
​
// 添加属性
Object.defineProperty(person, "year", {value:"2008",enumerable:true});
​
// 打印
document.getElementById("demo").innerHTML = "当前对象为：" + JSON.stringify( person );
</script>
​
</body>
</html>