<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title> new document </title>
<meta name="generator" content="editplus" />
<meta name="author" content="" />
<meta name="keywords" content="" />
<meta name="description" content="" />
</head>
<body>
<button onclick='godDay()'>点我</button>
<div id='demo'></div>
<script>
//根据系统时间自动问好
document.write('点按钮会向你问好哦')
function godDay(){
var x='';
var time=new Date().getHours();
if (8<time<13)
{
x='上午好';
}
else if(13<time<17)
{
x='下午好' ;
}
else
{
x='晚上好';
}
document.getElementById('demo').innerHTML=x;
}
</script>
</body>
</html>
