1、首先页面须要一区域用于显示时间
<div id="showDate"></div>

2、获取时间
<script type="text/javascript">
	$(function(){
		setInterval("getTime();",1000); //每隔一秒运行一次
	})
	//取得系统当前时间
	function getTime(){
		var myDate = new Date();
		var date = myDate.toLocaleDateString();
		var hours = myDate.getHours();
		var minutes = myDate.getMinutes();
		var seconds = myDate.getSeconds();
		$("#showDate").html(date+" "+hours+":"+minutes+":"+seconds); //将值赋给div
	}
</script>