js 常用时间日期函数

// js 常用时间日期函数
function load(){
 var time = new Date( ); //获得当前时间
 var year = time.getFullYear();   //获得年
 var month = (time.getMonth()+1);   //获得月份 0-11
 if(month<10){
  month = '0' + month;
 }
 var ri = time.getDate();       //获得日期 1-31
 if(ri<10){
  ri = '0' + ri;
 }
 var hour = time.getHours( );   //获得小时  0-23
 var minute = time.getMinutes( );  //获得分钟  0-59
 if(minute<10){
  minute = "0"+minute;
 }
 var second = time.getSeconds( );   //获得秒  0-59
 if(second<10){
  second = "0" + second;
 }
 //var hm = time.getMilliseconds();   获得毫秒 0-999
 var day = time.getDay();    //获得星期 0-6
 document.getElementById("now_time").style.color = '#2A7EB7'; //改变了颜色
 switch(day){
  case 0:
   day = "星期日";
   if(day == "星期日"){
    document.getElementById("now_time").style.color = '#F00'; //改变了颜色
   }
   break;
  case 1:
   day = "星期一";
   break;
  case 2:
   day = "星期二";
   break;
  case 3:
   day = "星期三";
   break;
  case 4:
   day = "星期四";
   break;
  case 5:
   day = "星期五";
   break;
  case 6:
   day = "星期六";
   if(day == "星期六"){
    document.getElementById("now_time").style.color = '#F00';  //改变style里面颜色的属性
   }
   break;
 }

 time =year + "年  "+ month +"月"+ri+"日 "+  hour+":"+minute+":"+second +"  "+day;
 document.getElementById("now_time").innerHTML = time;
 //var time = setTimeout("load()",1000);     //setTimeout()小 setInterval()大  看看CUP使用率
}
var time = setInterval("load()",1000);