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const与let都具有块级作用域

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L0standfound

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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

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

for (let i=0; i<100; i++) {...} //i 仅在括号内有效

Yangsirgo2015

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

function foo(){ const a=3.14;} alert(a);//Uncaught ReferenceError: a is not defined const常量在块作用域外不能访问。所以这个是报错的。

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