时间js

function Appendzero (obj) {
    if (obj < 10) return "0" + obj; else return obj;
}
function getWeek () {
   var weeknum = new Date().getDay ();
   var week = "";
   if (weeknum == 0)  week = "星期日";
   if (weeknum == 1)  week = "星期一";
   if (weeknum == 2)  week = "星期二";
   if (weeknum == 3)  week = "星期三";
   if (weeknum == 4)  week = "星期四";
   if (weeknum == 5)  week = "星期五";
   if (weeknum == 6)  week = "星期六";
   return week;
}
function getDate(){
   var now = new Date ();
   var year = now.getFullYear ();//获取四位数年数
   var month = now.getMonth () + 1;
   var date = now.getDate ();
   var s = year + "-" + Appendzero (month) + "-" + Appendzero (date) 
   return s;
}
function getTime(){
    var now = new Date ();
    var hour = now.getHours ();
    var minute = now.getMinutes ();
    var second = now.getSeconds ();
    var s = Appendzero (hour) + ":" + Appendzero (minute) + ":" + Appendzero (second);
    return s;
}
function getTime2(){
    var now = new Date ();
    var hour = now.getHours ();
    var minute = now.getMinutes ();
    var s = Appendzero (hour) + ":" + Appendzero (minute)
    return s;
}
//设置动态时间
function setTime1(id){
      document.getElementById("id").innerHTML = getTime2();
     window.setTimeout("setTime("+id+")", 1000);
}
//设置动态时间
function setTime2(id){
      document.getElementById("id").innerHTML = getTime1();
     window.setTimeout("setTime("+id+")", 1000);
}