<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h1 id="t">当前时间是：<span></span>年<span></span>月<span></span>日<span></span>时<span></span>分<span></span>秒</h1>
</body>
<script>
var ss=document.getElementById('t').getElementsByTagName('span');
function changetime(){
var time=new Date();
ss[0].innerHTML=time.getFullYear();
ss[1].innerHTML=time.getMonth()+1;
ss[2].innerHTML=time.getDate();
ss[3].innerHTML=time.getHours();
ss[4].innerHTML=time.getMinutes();
ss[5].innerHTML=time.getSeconds();
}
changetime();
setInterval(function(){
changetime();
},1000)
</script>
</html>