异常处理

function sum(num1, num2){
            if(num1 == undefined || num2 == undefined){
                throw {
                    errMsg: "能不能好好玩耍了，乖乖给我传参！！",
                    errCode: 13888888888
                };
            }else{
                return num1 + num2;
            }
        }

//        sum(0);

        try{
            sum(0);
        }
        catch(e){
            console.log(e.errMsg);
        }