<html><body><h2>JavaScript Object.defineProperty()</h2><p>此示例更改属性值。</p><p id="demo"></p><script>// 创建一个对象：var person = { firstName: "John", lastName : "Doe", language : "EN" };// Change a propertyObject.defineProperty(person, "language", {value:"NO"})document.getElementById("demo").innerHTML = person.language;</script></body></html>