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# 概述 | ||
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> 一个变量,就是一个用于存放数值的容器。这个数值可能是一个用于累加计算的数字,或者是一个句子中的字符串。变量的独特之处在于它存放的数值是可以改变的。 | ||
# 声明 | ||
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## let、const和var | ||
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# Hoisting(变量提升) | ||
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# 命名变量:规则和最佳实践 | ||
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# 变量的作用域 |