摘要:
![](https://images2018.cnblogs.com/blog/1179506/201804/1179506-20180414201303041-290579664.png)
![](https://images2018.cnblogs.com/blog/1179506/201804/1179506-20180414201331083-2087613836.png)
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摘要:
variable declarations : let, const,and block scope why we redefine the way about declarations? function scope The next we can use IIFE to check var va 阅读全文