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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 语句</h1>
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<h2>const 语句</h2>
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<p>声明一个常量对象不会使属性不可更改：</p>
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<p id="demo"></p>
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<script>
// 创建对象：
const car = {type:"Porsche", model:"911", color:"white"};
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// 更改属性：
car.color = "red";
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// 添加属性：
car.owner = "Bill";
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// 显示属性：
document.getElementById("demo").innerHTML = "Car owner is " + car.owner; 
</script>
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</body>
</html>
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