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ES6 新知识

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烟云怀僧

#1 Created at ... [Delete] [Delete and Lock User]

let 申明块级作用域 const 定义常量

L0standfound

#2 Created at ... [Delete] [Delete and Lock User]

const也是块级

L0standfound

#3 Created at ... [Delete] [Delete and Lock User]

老师说的"const与let都具有块级作用域", const的块级作用域如何理解?

小云云揍斯额

#4 Created at ... [Delete] [Delete and Lock User]

函数是块，if for while 一切用{}包裹的都是块 {let i = 1;} alert(i); //ReferenceError

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