方法一：只要把下面的js放到你想要显示的地方就ok
setInterval("shijian.innerHTML=new Date().toLocaleString()+' 星期'+'日一二三四五六'.charAt(new Date().getDay());",1000);
方法二：首先在body标签添加onload事件 ：<body onload="dispDate()">。
var divGreet=document.getElementById("greet");这是获取要显示的标签的id，所以要在你要显示的地方加以一个标签 如：<span id="greet"></span>；
| <script language="javascript"> | |
| function dispDate() | |
| { | |
| var date=new Date(); | |
| var hour=date.getHours(); | |
| var year=date.getYear(); | |
| var month=date.getMonth(); | |
| var day=date.getDate(); | |
| var strDate; | |
| var dayofWeek=date.getDay(); | |
| //arrDays = ['日','一','期二','三','四','五','六']; | |
| //dayofWeek=arrDays[dayofWeek]; | |
| strDate=year+"年"+month+"月"+day+"日"+" 星期"+dayofWeek; | |
| //alert(hour); | |
| var divGreet=document.getElementById("greet"); | |
| if(hour>=6&&hour<12) | |
| { | |
| divGreet.innerText="上午好!"+strDate; | |
| } | |
| if(hour>=12&&hour<=18) | |
| { | |
| //var divGreet=document.getElementById("greet"); | |
| divGreet.innerText="下午好!"+strDate; | |
| //alert(divGreet.innerText); | |
| } | |
| if((hour>18&&hour<=23)||(hour>=0&&hour<6)) | |
| { | |
| //var divGreet=document.getElementById("greet"); | |
| divGreet.innerText="晚上好!"+strDate; | |
| //alert(divGreet.innerText); | |
| } | |
| } | |
| </script> |