现场演示：我的 HTML 文档

xxxxxxxxxx
 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>JavaScript Remove Properties from an Object</title>
</head>
<body>
    <script>
    var person = {
        name: "Peter",
        age: 28,
        gender: "Male",
        displayName: function() {
            alert(this.name);
        }
    };
    
    // Deleting property
    delete person.age;
    document.write(person.age); // Prints: undefined
    </script>
</body>
</html>