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js special effects: js realizes the effect code of somersault cloud

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不言Original
2018-08-14 16:50:122573browse

The content of this article is about js special effects: the js effect code for realizing somersault cloud, which has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Understand the principle of easing animation

<!DOCTYPE html>
<!--create by ydj on 2018-08-12-->
<html>
	<head>
		<meta charset="UTF-8">
		<title>筋斗云</title>
		<style>
        *{margin: 0; padding: 0;}
        ul {list-style:none;}
        body {
            background-color: #000;
        }
        .nav {
            width: 800px;
            height: 42px;
            background:url("images/rss.png") no-repeat right center #fff;
            margin: 100px auto;
            border-radius: 5px;
            position: relative; 
        }
        .cloud {
            width: 83px;
            height: 42px;
            position: absolute;
            top: 0;
            left: 0;
            background: url("images/cloud.gif") no-repeat;
        }
        .nav ul {
            position: absolute;
            top: 0;
            left: 0;
        }
        .nav li {
            float: left;
            width: 83px;
            height: 42px;
            line-height: 42px;
            text-align: center;
            color: #000;
            cursor: pointer;
        }
    </style>
	</head>
	<body>
		<p class="nav" id="nav">
			<span class="cloud" id="cloud"></span>
			<ul>
				<li>AI数据中心</li>
				<li>财务中心</li>
				<li>事业中心</li>
				<li>陆兵学院</li>
				<li>供应中心</li>
				<li>总经办</li>
				<li>品牌中心</li>
				<li>人力中心</li>
			</ul>
		</p>
	</body>
</html>
<script>
	// 获取元素
	var cloud = document.getElementById("cloud");
	var nav = document.getElementById("nav");
	var lis = nav.children[1].children;
	// 记录点击时的位置
	var current = 0;
	for (var i = 0; i < lis.length; i++) {
		lis[i].onmouseover = function(){
			target = this.offsetLeft;
		}
		lis[i].onclick = function(){
			current = this.offsetLeft;
		}
		lis[i].onmouseout = function(){
			target = current;
		}
	}
	// 缓动动画
	var leader = 0,target =0;
	setInterval(function(){
		leader = leader + (target -leader)/10;
		cloud.style.left = leader + "px";
	},10);
	
</script>

Effect

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