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<!DOCTYPE html> <html> <body> <h1>JavaScript Objects</h1> <h2>The Object.keys() Method</h2> <p>This example list the enumerable properties of an object.</p> <p id="demo"></p> <script> // Create an object: const person = { firstName: "John", lastName: "Doe", age: 50, eyeColor: "blue" }; // Change Property Object.defineProperty(person, "age", {enumerable:false}); // Display Properties document.getElementById("demo").innerHTML = Object.keys(person); </script> </body> </html>
