<html><body><h2>JavaScript defineProperty()</h2><p id="demo"></p><script>// 创建一个对象：var person = { firstName: "John", lastName : "Doe", language : "NO", };// 改变一个属性：Object.defineProperty(person, "language", { value: "EN", writable : true, enumerable : false, configurable : true});// 枚举属性txt = "";for (var x in person) { txt += person[x] + "<br>";}document.getElementById("demo").innerHTML = txt;</script></body></html>