JavaScript 함수의 연습 문제

연습 문제

function ok_alert(){
    alert("ok");
}
ok_alert();

function sum(n1){
    alert(n1);
}    
sum("一文字");

function two(one,two){
    var sumTwo = one + two;
    alert(sumTwo);
}    
two(1,2);

function three(one, two, three){
    var sumThree = one + two + three;
    alert(sumThree);
}
addTh(1,2,3);     

function idColor(id,color){
    document.querySelector(id).style.backgroundColor = color;
}
idColor("div", "red");

function nowTime(){
    var now   = new Date();
    var year  = now.getFullYear();
    var month = now.getMonth()+1;
    var date  = now.getDate();
    var time = "現在"+year+"年"+month+"月"+date+"日";
    alert(time);
}   
nowTime();