实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<!DOCTYPE html>
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<html>
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<head>
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    <title>Data Properties Example</title>
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    <script type="text/javascript">
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​
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        var person = {};
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        Object.defineProperty(person, "name", {
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            writable: false,
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            value: "Nicholas"
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        });
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        alert(person.name);
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        person.name = "Michael";
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        alert(person.name);
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​
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​
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    </script>
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</head>
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<body>
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    <p>Note: this example only works in browsers that have implemented the ECMAScript 5 <code>Object.defineProperty()</code> method (IE9 and Firefox 4).</p>
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</body>
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</html>