封装一个函数, 求数组的和.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    //封装一个函数, 求数组的和.
    //实例: console.log( sum([1, 2, 3, 4, 5]) ); 返回结果: 15;
    function sum(arr) {
        var res = 0;
        for (var i = 0; i < arr.length; i++) {
            res += arr[i];
        }
        return res;
    }

    console.log(sum([1, 2, 3, 4, 5, 6, 7]));
</script>
</body>
</html>

posted on 2019-01-09 09:12 猛兽阅读(728) 评论(0) 编辑收藏举报