​x
 
<!DOCTYPE html>
<html>
<body>
​
<h1>JavaScript 对象</h1>
​
<h2>: 运算符</h2>
​
<p id="demo"></p>
​
<script>
const size = {x: 5, y: 10, z: 1};
​
document.getElementById("demo").innerHTML = "宽度是："  + size.x;
</script>
​
</body>
</html>
​