本内容遵循CC 4.0 BY-SA版权协议 代码评审做了几年，我发现一个规律：很多写了两年 JavaScript 的开发者，能熟练使用 let 和 const ，但被问到"为什么不用 var "时，只能答出" var 有变量提升，不好用 ...
@devongovett I think what we really need is language-level chunking support that lets us capture the benefits of scope hoisting without incurring the costs of scope hoisting itself.
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