<!DOCTYPE html>
<html>
<body>
<h1>JavaScript Number 对象属性</h1>
<p>对变量、表达式或值使用数字属性,将返回 undefined:</p>
<p id="demo"></p>
<script>
var x = 6;
document.getElementById("demo").innerHTML = x.MAX_VALUE;
</script>
</body>
</html>