function tick() { 
var hours, minutes, seconds, xfile; 
var intHours, intMinutes, intSeconds; 
var today; 
today = new Date(); 
intHours = today.getHours(); 
intMinutes = today.getMinutes(); 
intSeconds = today.getSeconds(); 
if (intHours == 0) { 
hours = "12:"; 
xfile = "当前时间：午夜 "; 
} else if (intHours < 12) { 
hours = intHours+":"; 
xfile = "当前时间：上午 ";
} else if (intHours == 12) { 
hours = "12:"; 
xfile = "当前时间：正午 "; 
} else { 
intHours = intHours - 12 
hours = intHours + ":"; 
xfile = "当前时间：下午 "; 
} 
if (intMinutes < 10) { 
minutes = "0"+intMinutes+":"; 
} else { 
minutes = intMinutes+":"; 
} 
if (intSeconds < 10) { 
seconds = "0"+intSeconds+" "; 
} else { 
seconds = intSeconds+" "; 
} 
timeString = xfile+hours+minutes+seconds; 
document.getElementById("timediv").innerHTML=timeString 
window.setTimeout("tick();", 1000); 
} 
window.onload=tick