<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS显示与隐藏</title>
</head>
<body onload="startTime()">
<script type="text/javascript">
function getDate() {
var nowTime=new Date();
var strTime=nowTime.toLocaleString();
var a=document.getElementById("myDiv");
a.innerHTML=strTime;
}
function startTime() {
window.setInterval("getDate()",1000);
}
</script>
<div id="myDiv"></div>
</body>
</html>
原文：https://www.cnblogs.com/god1/p/12116113.html