原技巧给出的总纲只有一句话： 变量声明和函数定义会被提升到顶部；变量定义不会，即使你在一行内同时声明并定义变量。 这一规律适用于 var 声明的变量与函数声明（function declaration），是理解下述所有示例的钥匙。

" → const 只是锁定变量绑定，不允许重新赋值；对象内部属性仍可修改，这与传值机制中的"绑定不可变、内部可变"同理。 面试速答 ："JavaScript 统一按值传递；对象传递的是引用的副本，所以改属性外泄、改绑定不外泄，更准确的叫法是 Call-by-Sharing。

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