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<!DOCTYPE html> <html> <body> <h2>JavaScript 常量</h2> <p>声明一个常量对象不会使对象属性不可更改：</p> <p id="demo"></p> <script> // 创建一个对象： const car = {type:"Fiat", model:"500", color:"white"}; // 改变一个属性： car.color = "red"; // 添加一个属性： car.owner = "Johnson"; // 显示属性： document.getElementById("demo").innerHTML = "Car owner is " + car.owner; </script> </body> </html>