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ES6let、const和var的区别 #12

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Pieces312 opened this issue Sep 24, 2020 · 0 comments

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Pieces312 commented Sep 24, 2020

ES5 var
由于ES5只有全局作用域和函数作用域，所以会出现内层变量覆盖外层变量的情况。使用var声明的变量会出现变量提升的情况。

ES6 let/const
在ES6中，新增let/const声明变量的方法，他们的一个共同点都是声明块级作用域。也就是所有的变量，只有在let/const命令所在的代码块内有效。

文章链接：https://www.juejin.im/post/6854573219450454029

Pieces312 added the JavaScript label

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