返回顶部模仿天猫的返回顶部代码 HTML JQuery CSS JavaScript

╰+哭是因爲堅強的太久メ 2022-06-18 08:07 252阅读 0赞

关于返回顶部这个功能，绝大部分网站都有用到，算是一个细节方面的小东西，个人觉得天猫的返回顶部这个小东西做的挺好，下面便是我模仿它的代码：

HTML：

</!DOCTYPE html>
    <html>
    <head>
    	<title>返回顶部,模仿某猫</title>
    
    	<link rel="stylesheet" type="text/css" href="css.css">
    </head>
    <body id="page">
    	<h1>返回顶部</h1>
    	<h2>返回顶部</h2>
    	<h3>返回顶部</h3>
    	<h4>返回顶部</h4>
    	<h5>返回顶部</h5>
    	<h1>返回顶部</h1>
    	<h2>返回顶部</h2>
    	<h3>返回顶部</h3>
    	<h4>返回顶部</h4>
    	<h5>返回顶部</h5>
    	<h1>返回顶部</h1>
    	<h2>返回顶部</h2>
    	<h3>返回顶部</h3>
    	<h4>返回顶部</h4>
    	<h5>返回顶部</h5>
    	<h1>返回顶部</h1>
    	<h2>返回顶部</h2>
    	<h3>返回顶部</h3>
    	<h4>返回顶部</h4>
    	<h5>返回顶部</h5>
    	<h1>返回顶部</h1>
    	<h2>返回顶部</h2>
    	<h3>返回顶部</h3>
    	<h4>返回顶部</h4>
    	<h5>返回顶部</h5>
    	<script type="text/javascript" src="jquery.min.js"></script>
    	<script type="text/javascript" src="script.js"></script>
    </body>
    </html>

CSS：

#gotoTop {
    	box-sizing: border-box;
    	display: none;
    	position: fixed;
    	bottom: 10%;
    	right: 20px;
    	cursor: pointer;
    	padding: 9px 2px;
    	width: 40px;
    	height: 40px; text-align : center;
    	border: 1px solid #e0e0e0;
    	z-index: 99;
    	background: #000
    		url("data:image/png;base64,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");
    	background-size: 100% auto;
    	text-align: center;
    }
    
    #gotoTop {
    	_position: absolute;
    	_top: expression(documentElement.scrollTop + documentElement.clientHeight * 3/
    		4 + "px")
    }
    
    #gotoTop.hover {
    	background: #165ec5
    		url("data:image/png;base64,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");
    	text-decoration: none;
    	background-size: 100% auto;
    }
    
    .fay-tip:hover p{
    	display:block;
    	transform-origin: 100% 0%;
    
    	-webkit-animation: topFadeIn 0.4s ease-in-out;
    	animation: topFadeIn 0.4s ease-in-out;
    }
    
    .fay-tip p{
    	display:none;
    	background-color: #494949;
    	padding: 10px;
    	width: 80px;
    	position: absolute;
    	box-shadow: 1px 1px 1px rgba(0, 0, 0, 0.2);
    	right: 38px;
    	color: #FFF;
    	font-size: 13px;
    	line-height: 1.4;
    	top:0;
    	margin: 0 0 10px;
    }
    
    .fay-tip p:before{
    	position: absolute;
    	content: '';
    	width:0;
    	height: 0;
    	border:6px solid transparent;
    	border-bottom-color:#494949;
    	right:-12px;
    	top:10px;
    	border-color: transparent transparent transparent #494949;
    }
    
    .fay-tip p:after{
    	width:100%;
    	height:40px;
    	content:'';
    	position: absolute;
    	top:0;
    	left:80px;
    }
    
    @-webkit-keyframes topFadeIn {
    	0% { 
    		right:80px;
    		opacity:0; 
    		transform: scale(0.6);
    	}
    
    	100% {
    		right:38px;
    		opacity:100%;
    		transform: scale(1);
    	}
    }
    
    @keyframes topFadeIn {
    	0% {
    		right:80px;
    		opacity:0; 
    	}
    	100% {
    		right:38px;
    		opacity:100%; 
    	}
    }

JS：

gotoTop();
    
    function gotoTop(min_height) {
    	// 预定义返回顶部的html代码，它的css样式默认为不显示
    	var gotoTop_html = '<div id="gotoTop" class="fay-tip"><p>返回顶部</p></div>';
    	// 将返回顶部的html代码插入页面上id为page的元素的末尾
    	$("#page").append(gotoTop_html);
    	$("#gotoTop").click(// 定义返回顶部点击向上滚动的动画
    	function() {
    		$('html,body').animate({
    			scrollTop : 0
    		}, 700);
    	}).hover(// 为返回顶部增加鼠标进入的反馈效果，用添加删除css类实现
    	function() {
    		$(this).addClass("hover");
    	}, function() {
    		$(this).removeClass("hover");
    	});
    	// 获取页面的最小高度，无传入值则默认为600像素
    	min_height ? min_height = min_height : min_height = 0;
    	// 为窗口的scroll事件绑定处理函数
    	$(window).scroll(function() {
    		// 获取窗口的滚动条的垂直位置
    		var s = $(window).scrollTop();
    		// 当窗口的滚动条的垂直位置大于页面的最小高度时，让返回顶部元素渐现，否则渐隐
    		if (s > min_height) {
    			$("#gotoTop").fadeIn(100);
    		} else {
    			$("#gotoTop").fadeOut(200);
    		}
    	});
    }

至于jQuery就不用介绍了，基本上大家都了解，希望帮助那些纠结于实现返回顶部的朋友们。