现场演示：我的 HTML 文档

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>JavaScript ES6 Constants are Not Truly Immutable</title>
</head>
<body>
    <script>
    // Changing object property value
    const PERSON = {name: "Peter", age: 28};
    document.write(PERSON.age + "<br>"); // 28
    PERSON.age = 30;
    document.write(PERSON.age + "<hr>"); // 30
    
    // Changing array element
    const COLORS = ["red", "green", "blue"];
    document.write(COLORS[0] + "<br>"); // red
    COLORS[0] = "yellow";
    document.write(COLORS[0]); // yellow
    </script>
</body>
</html>