为什么“& typeof&"与& quot; typeof()& amp; quot;相同吗? [英] Why is "typeof" the same as "typeof()"?

问题描述

我正在学习JavaScript，并且在代码中看到使用 typeof 和 typeof()的代码是相同的，例如:

两种情况下的结果均为数字

  console.log(typeof 1);console.log(typeof(1)); 

根据 解决方案

typeof is, according to ES5 spec, an unary operator - the same as void and delete, for example. Wrapping its expression with grouping () is only done for convenience (and - in theory - to override the default precedence), but never it's treated as a function call.

这篇关于为什么“& typeof&"与& quot; typeof()& amp; quot;相同吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！