js--获得当前系统时间

window.onload = function () {
var oBody = document.body;
setInterval( fnTime, 1000 );
fnTime ();
function fnTime () {
var myTime = new Date();  //new Date()---获取当前的系统时间
// number
var iYear = myTime.getFullYear();
var iMonth = myTime.getMonth()+1;   //myTime.getMonth()与真实的月份差1，所以需要加上1
var iDate = myTime.getDate();
var iWeek = myTime.getDay();  //获得的是数字，周日获得的是0
var iHours = myTime.getHours();
var iMin = myTime.getMinutes();
var iSec = myTime.getSeconds();
var str = '';

if( iWeek === 0 ) iWeek = '星期日';
if( iWeek === 1 ) iWeek = '星期一';
if( iWeek === 2 ) iWeek = '星期二';
if( iWeek === 3 ) iWeek = '星期三';
if( iWeek === 4 ) iWeek = '星期四';
if( iWeek === 5 ) iWeek = '星期五';
if( iWeek === 6 ) iWeek = '星期六';
//把每个时间值串联在一起
str = iYear+ '年' +iMonth+'月'+iDate+'日 '+iWeek+' '+ toTwo(iHours)+' : '+ toTwo(iMin)+' : '+ toTwo(iSec);
oBody.innerHTML = str;
}
};

//0-9这样的数字转换成两位01.02等等
function toTwo ( n ) {
return n < 10 ? '0' + n : '' + n;
}