在线运行代码 - 菜鸟教程

<!DOCTYPE html>
<html>
<head> 
<meta charset="utf-8"> 
<title>菜鸟教程(cainiaoplay.com)</title>
</head>
<body>

<h2>JavaScript const</h2>

<p>我们不能对常量对象重新赋值:</p>

<p id="demo"></p>

<script>
try {
    const car = {type:"Fiat", model:"500", color:"white"};
    car = {type:"Volvo", model:"EX60", color:"red"};
}
catch (err) {
    document.getElementById("demo").innerHTML = err;
}
</script>

</body>
</html>

源代码

动行结果