JavaScript-leaning/function.html at master · LaderBen/JavaScript-leaning · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
        /*
        function show(){
            return 12;
        }

        var a = show();
        alert(show());
        alert(a);
*/
        //函数定义
        function sum(a, b) {
            return a + b;
        }
        alert(sum(1, 2));

        //arguments 可变参数/不定参数
        //arguments 是一个数组，其存了所有的参数
        function sumArgu() {
            var result = 0;
            for (var i = 0; i < arguments.length; i++) {
                result += arguments[i];
            }
            return result;
        }

        alert(sumArgu(12, 4, 3, 5, 3));
    </script>
</head>

<body>

</body>

</html>