}
或
function showtime()
{
var now = new Date();
var h = now.getHours();
var m = now.getMinutes();
var s = now.getSeconds();
var m2="";
var s2="";
if(m<10)m2="0"+m;
else m2=m;
if(s<10)s2="0"+s;
else s2=s;
var txt = h+":"+m2+":"+s2;
var p = document.getElementById("txt_time");
p.value="现在时刻:"+txt;