​x
 
<!DOCTYPE html>
<html>
<body>
​
<h2>JavaScript const</h2>
​
<p>但是你不能重新赋值一个常量对象：</p>
​
<p id="demo"></p>
​
<script>
try {
  const car = {type:"Porsche", model:"911", color:"white"};
  car = {type:"BMW", model:"M5", color:"red"};
}
catch (err) {
  document.getElementById("demo").innerHTML = err;
}
</script>
​
</body>
</html>
​