jquery清明节倒计时-2019年4月1号 - jquery

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<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>JQ事件</title>
		<link rel="stylesheet" type="text/css" href="">
		<script type="text/javascript" src="static/jquery-3.3.1.min.js"></script>
		<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
		<style type="text/css">
			*{
				margin:0;
				padding:0;
			}
			.main{
				width: 100%;
			}
			.container{
				width: 1000px;
				height: 150px;
				background: red;
				margin: 20px auto;
				text-align: center;
				line-height: 150px;
				color:#fff;
				font-size: 30px
			}
		</style>
	</head>
	<body>
		<div class="main">
			<div class="container">
				<p>距离清明节还有<span> </span></p>
			</div>
			<span>点击变色</span>
		</div>
		<script type="text/javascript">
			//入口函数
			$(function(){
			//检测jQ是否加载成功
				if(typeof $=='undefined'){
					console.log('JQ未成功加载');
				}else{
					console.log('JQ加载成功');
				}
			//jQ事件：格式：$('选择器').事件( function(){} )
				$('.main>span').css('display','none');
				$('.main>span').click(function(){
					$('body').css('background','#ccc');
				})
			//倒计时
				function count_down(){
					var d=Date.parse("Apr 05,2019");
					var date=new Date();
					var dd=date.getTime();
					var a=Math.floor((d-dd)/86400000);//天
					var b=Math.floor(((d-dd)%86400000)/3600000)//小时
					var c=Math.floor((((d-dd)%86400000)%3600000)/60000)//分钟
					var e=Math.floor(((((d-dd)%86400000)%3600000)%60000)/1000)//秒
					$('p>span').text(a+"天"+b+"时"+c+"分钟"+e+"秒");
				}
				setInterval(count_down,1);
			})
		</script>
	</body>
</html>

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