<!DOCTYPE html>
<html lang="zh-cn">
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<p>当前的时间:<span id="nowTime"></span></p>
<script>
var now = new Date();
var hh = now.getHours();
var mm = now.getMinutes();
var ss = now.getSeconds();
var nowTime = document.getElementById("nowTime");
function getDateWeek(obj) {if (obj < 10) return "0" + obj; else return obj;}
nowTime.innerHTML = getDateWeek(hh) + ":" + getDateWeek(mm) + ":" + getDateWeek(ss);
</script>
</body>
</html>
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效果图：
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原文：http://onestopweb.iteye.com/blog/2270671