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你好，对`前端开发面试题`中有几处疑问 #87

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wly2014 opened this issue Apr 1, 2017 · 1 comment

wly2014 commented Apr 1, 2017

说几条写JavaScript的基本规范？中的第9条：for-in循环中的变量应该使用var关键字明确限定作用域，从而避免作用域污染。是不是应该使用let关键字？let才能实现for这种块级作用域不是？
Javascript作用链域?中：当需要从局部函数查找某一*属性*或方法时，如果当前作用域没有找到，其中的属性是不是改成变量更好些？属性不是按原型链去查找的吗？
望指教^_^

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jonirrings commented Apr 3, 2017

我觉得针对es5，是写个var之后避免造成全局/上级污染。当然es6中推荐let/const咯
👍赞同

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