html运行实例（js_type_unary_addition

代码示例：（标识：js_type_unary_addition_2）

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript typeof 运算符</h2>

<p>typeof 运算符返回变量或表达式的类型：</p>

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

<script>
let y = "Bill";
let x = + y;
document.getElementById("demo").innerHTML = typeof y + "<br>" + typeof x;
</script>

</body>
</html>