html运行实例（js_es6_exponent

代码示例：（标识：js_es6_exponent_3）

<!DOCTYPE html>
<html>
<body>

<h1>求幂赋值 (**=)</h1>

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

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

</body>
</html>