老师，请检测，哪里能优化？另外this怎么用，后续有单独讲解吗？

来源：4-11 编程练习

慕神4155339

2020-05-06 15:41:54

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>4-11 编程练习</title>
</head>
<body>
    <script>
        function add(num1,num2){
            function inNumber(){
                for (var i=0;i<add.arguments.length;i++){
                    if (isNaN(add.arguments[i])){
                        console.log("true，非数字");
                        break;
                    }else{
                        console.log("false，数字");
                        return console.log(num1+num2);
                    }
                }
            }
            inNumber();
        }
        add(1,33);
    </script>
</body>
</html>

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