https://b.hatena.ne.jp/entry/s/developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/null ��� Learn Learn web development Frontend developer course Getting started modules Core modules MDN Curriculum Check out the video course from Scrimba, our partner Learn HTML Structuring content wit... https://b.hatena.ne.jp/Itisango/20220811#bookmark-4723669388382801282 ypeof null; // "object"; typeof undefined; // "undefined"; null === undefined // false; null == undefined // true; null === null; // true; null == null; // true; !null; // true; isNaN(1 + null); // false; isNaN(1 + undefined); // true” 2022-08-11T04:21:20Z あとで読む JavaScript null undefined expr spec https://b.hatena.ne.jp/fuyu77/20200126#bookmark-366249303 2020-01-25T15:19:30Z JavaScript