<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 数字</h1>
<p>前缀为 0x 的数值常量会被解释为十六进制：</p>
<p id="demo"></p>
<script>
var x = 0xFF;
document.getElementById("demo").innerHTML = "0xFF = " + x;
</script>
</body>
</html>