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Professional-JavaScript-for-Web-Developers-4th-Edition-reading-notes
ECMA-262将对象定义为一组属性的无序集合。可以把对象想象成一张散列表,内容就是一组键值对。 ECMA-262使用一些内部特性来描述属性的特征。为了将某个特性标识为内部特性,规范会用两个中括号把特性的名称括起来,比如[[Enumerable]]。 属性分两种:数据属性 ...
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