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var 定义的变量,没有块的概念,可以跨块访问, 不能跨函数访问。 let 定义的变量,只能在块作用域里访问,不能跨块访问,也不能跨函数访问。 const 用来定义常量,使用时必须初始化(即必须赋值),只能在块作用域里访问,而且不能修改。
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