JavaScript前端开发小问题呀啊啊

img

看代码

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script>
    function getSum(n,m){
      let num =0
      for (let i = n; i <= m; i++) {
        num = num + i
      }
      return num
    }
    console.log(getSum(5,10));
    console.log(getSum(100,1000));
  </script>
</head>
<body>
  
</body>
</html>