function showTime() {
var now = new Date();
var nowTime = now.toLocaleString();
var date = nowTime.substring(0,10);//截取日期
var time = nowTime.substring(10,20); //截取时间
var week = now.getDay(); //星期
var hour = now.getHours(); //小时
//判断星期几
var weeks = ["日","一","二","三","四","五","六"];
var getWeek = "星期" + weeks[week];
//alert(weeks[week])
var sc;
//判断是AM or PM
if(hour >= 0 && hour < 5){
sc = '凌晨';
}
else if(hour > 5 && hour <= 7){
sc = '早上';
}
else if(hour > 7 && hour <= 11){
sc = '上午';
}
else if(hour > 11 && hour <= 13){
sc = '中午';
}
else if(hour> 13 && hour <= 18){
sc = '下午';
}
else if(hour > 18 && hour <= 23){
sc = '晚上';
}
document.getElementById('time').innerHTML ="当前时间：" + date+" " + getWeek +" "+" "+sc+" "+time;
setTimeout('showTime()',1000);
}
1 <body onload="showTime()">
2 <div id="time"></div>