Deaktivieren Sie Maus mit der rechten Maustaste auf JavaScript
document.oncontextmenu = document.body.oncontextmenu = function() {return false;}
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document.oncontextmenu = document.body.oncontextmenu = function() {return false;}
document.addEventListener('contextmenu', event => event.preventDefault());
// ⇓ Test it (fiddle) ⇓document.addEventListener('contextmenu', event => event.preventDefault());