代码示例：（标识：eg_js_object_defineproperty_1）
<!DOCTYPE html>
<html>
<head>
<meta content="text/html; charset=iso-8859-2" http-equiv="Content-Type">
</head>
<body>
<h1>JavaScript defineProperty()</h1>
<p id="demo"></p>
<script>
// 创建对象：
var person = {
firstName: "Bill",
lastName : "Gates",
language : "NO",
};
// 更改属性：
Object.defineProperty(person, "language", {
value: "EN",
writable : true,
enumerable : true,
configurable : true
});
// 枚举属性
txt = "";
for (var x in person) {
txt += person[x] + "<br>";
}
document.getElementById("demo").innerHTML = txt;
</script>
</body>
</html>
