代码示例:(标识:eg_js_number_hex)
<!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>
运行结果: