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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JavaScript Cannot Add Property to a Non-extensible Object in Strict Mode</title> </head> <body> <script> "use strict"; var person = {name: "Peter", age: 28}; console.log(Object.isExtensible(person)); // true Object.freeze(person); // lock down the person object console.log(Object.isExtensible(person)); // false person.gender = "male"; // TypeError </script> <p><strong>Note:</strong> Please check out the browser console by pressing the f12 key on the keyboard.</p> </body> </html>
