前言

javaSE的运算符、选择语句、循环语句等都能在js使用，就不详细写在笔记里了

函数声明function

function 函数名(形参){}

<script>

        function computed(n,m,op){
            switch(op){
                case "+":
                    return n+m;
                    break;
                case "-":
                    return n-m;
                    break;
                case "*":
                    return n*m;
                    break;
                case "/":
                    return n/m;
                    break;
            }
        }

        var result = computed(3,5,"*");
        console.log(result);//15
    </script>