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一道面试题引发的“血案”
source link: https://juejin.im/post/5bab1d4ae51d450e4d2feb7a
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es6之前，js的作用域只有两种，全局作用域和函数作用域，没有像C和java那样的块级作用域，于是对于学了C或者java这类语言的然后学习js的同学来说，会遇到很多坑。js的这个特性导致了代码的可阅读性、维护性和容错性都不太好。因此es6可以用let来申明变量
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