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<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 PropertyObject.defineProperty(person, "age", {enumerable:false});// Display Propertiesdocument.getElementById("demo").innerHTML = Object.keys(person);</script></body></html>