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JavaScript变量的生命周期：为什么let不被提升
source link: https://juejin.im/post/5aa631ab5188255587233214
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原文链接：dmitripavlutin.com/variables-l… 提升实际上是把变量和函数定义移动到作用域顶部的过程，通常发生在变量声明var或函数声明function fun() {...} 。 当let（包括和let有同样声明行为的const和c
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