​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript ES5 对象 keys() 方法</h1>
​
<p>可以通过 Object.keys(object) 方法获取对象的可枚举属性</p>
​
<p id="demo"></p>
​
<script>
const person = {
  firstName: "Bill",
  lastName : "Gates",
  language : "EN"
};
​
Object.defineProperty(person, "language", {enumerable:false});
​
// 打印
document.getElementById("demo").innerHTML = "当前对象的可枚举属性为：" + JSON.stringify( Object.keys(person) );
</script>
​
</body>
</html>