function showtime()
{
today=new Date(); 
var year=today.getYear();
var month=today.getMonth()+1;
var day=today.getDate();
var hours = today.getHours(); 
var minutes = today.getMinutes(); 
var seconds = today.getSeconds(); 
var timeValue= hours;//((hours >12) ? hours -12 :hours);
timeValue += ((minutes < 10) ? ":0" : ":") + minutes+""; 
timeValue+=((seconds < 10) ? ":0" : ":") + seconds+""; 
var timetext=year+"年"+month+"月"+day+"日 "+timeValue
//document.write("<span  onclick=\"document.getElementById('time').value='"+timetext+"'\">"+timetext+"</span>"); 
document.getElementById("liveclock").innerText = timetext; //div的html是now这个字符串 
setTimeout("showtime()",1000); //设置过1000毫秒就是1秒，调用showtime方法 
}
window.onload=function(){
showtime();
}