20250202

code:javascript

(() => {

const Wrapped = {

confirm: (content) => window.confirm(content),

prompt: (content) => window.prompt(content),

};

const Referenced = {

confirm: window.confirm,

prompt: window.prompt,

};

Wrapped.confirm("are you sure?");

Referenced.confirm("aren't you sure?"); // Uncaught TypeError: 'confirm' called on an object that does not implement interface Window.

})();

Firefoxの開発者ツール上のREPLで上記のスクリプトを稼働させると、Referenced.confirmがエラーになる

追ってthis, globalThisでも検証したけどいずれもダメ

.bind()を使って元のオブジェクトにバインドしないといけない

code:javascript

(() => {

const ThisReferenced = {

confirm: this.confirm,

prompt: this.prompt,

};

const GlobalthisReferenced = {

confirm: globalThis.confirm,

prompt: globalThis.prompt,

};

ThisReferenced.confirm("aren't you sure?"); // Uncaught TypeError: 'confirm' called on an object that does not implement interface Window.

GlobalthisReferenced.confirm("aren't you sure?"); // Uncaught TypeError: 'confirm' called on an object that does not implement interface Window.

})();