https://b.hatena.ne.jp/entry/s/developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015. * Some parts of this feature may have varying levels of sup... https://b.hatena.ne.jp/clavier/20110525#bookmark-43802982 2011-05-24T16:29:09Z javascript reference https://b.hatena.ne.jp/efcl/20110524#bookmark-43802982 MSDNのObject周りのリファレンス。ES5についても載ってる 2011-05-24T09:45:07Z JavaScript IE JScript リファレンス