html运行实例（js_arithmetric_exponent

代码示例：（标识：js_arithmetric_exponent_1）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 算术</h1>

<h2>** 运算符</h2>

<p id="demo"></p>

<script>
let x = 5;
document.getElementById("demo").innerHTML = x ** 2;
</script>

</body>
</html>