let和const不会变量提升

建议你去阅读英文原文，关于你这块，MDN的描述是

The other difference between var and let is that the latter is initialized to a value only when a parser evaluates it (see below).

他并没有对于变量提升的相关描述，如果你纠结于这个问题，不如去阅读 https://stackoverflow.com/questions/31219420/are-variables-declared-with-let-or-const-hoisted 的相关讨论

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