有待添加，先列出参考文档。关键字：seal, freeze, configurable of property。
参考文档：
（1）https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty
（2）https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/seal
（3）https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze
js中的Object.seal()与Object.freeze()
原文：https://www.cnblogs.com/tlz888/p/10385162.html