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>在浏览器环境中，我们也无法单纯依靠 JavaScript 代码实现 div 对象，只能靠 document.createElement 来创建，也说明了 JavaScript 的对象机制并非简单的属性集合 + 原型
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## 对象分类
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- 宿主对象 (host Object) :
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- 内置对象 (Built-in Objects)
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