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js 的build-in Object , Global 和 Math

 
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js 中有两个内置对象, Global 和 Math
内置对象的定义:由ECMAScript 实现提供的,独立于宿主环境的对象,在ECMAScript程序
开始执行时出现,开发者不必实例化内置对象,它已被实例化了。
内置对象都是 ECMAScript 本地对象。

Global 对象
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