老师，帮我看看秒的后面为什么会显示undefined出来？

来源：5-6 编程练习

广东靓仔

2019-06-14 10:22:46

 function newday(){
            var today=new Date(),
             year=today.getFullYear(),
             month=today.getMonth()+1,
             date=today.getDate(),
             week=today.getDay(),
             hours=today.getHours(),
             minutes=today.getMinutes(),
             seconds=today.getSeconds(),
            
            weeks=["日","一","二","三","四","五","六"];
        document.write("今天是"+year+"年"+month+"月"+date+"日"+"星期"+weeks[week]+"<br>"+hours+":"+minutes+":"+seconds);
        }
       var a=newday();
        document.write(a);

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