html运行实例（js_oper_add）-搜寻教程库

代码示例：（标识：js_oper_add）

<!DOCTYPE html>
<html>
<body>

<h1>JavaScript 算术</h1>

<h2>+ 运算符</h2>

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

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

</body>
</html>