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let和const不会变量提升 #5

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cloudy-rain opened this issue May 22, 2022 · 1 comment

cloudy-rain commented May 22, 2022

https://github.com/WindrunnerMax/EveryDay/blob/master/JavaScript/ES6新特性.md
这里写到“var会变量提升，let与const也存在变量提升但有所不同。”
但是参考 https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Statements/let#描述
其实是不会提升的

Owner

WindRunnerMax commented May 22, 2022

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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