未定义 !== 未赋值
原文英文,约200词,阅读约需1分钟。发表于: 。Here’s one of the most frequently asked interview questions: Why is Not Defined not equal to undefined? In this post, we will discuss this topic in detail and I will explain the differences...
本文解释了 Not Defined 和 undefined 的区别。undefined 指变量已声明但未赋值,存在于内存中。Not Defined 指变量未声明或超出作用域,不存在于内存中,访问会导致 ReferenceError。