html5菜单折纸效果

最新推荐文章于 2024-02-08 21:26:12 发布

最新推荐文章于 2024-02-08 21:26:12 发布 · 202 阅读

文章标签：

#javascript #ViewUI

本文介绍了一个模仿猎豹浏览器安装时显示用户须知效果的网页示例。通过HTML、CSS及JavaScript实现了纸张折叠动画，展示了页面元素从展开到折叠的状态变化。

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类似猎豹浏览器安装时的用户须知效果。

效果不是那么好，有那个意思，接缝比较大。

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>fold paper effect by gt</title>
<style>
#wrapper {
-webkit-perspective: 55cm;
-webkit-perspective-origin: 50% 50%;
text-align: center;
}

.paper {
position: relative;
height: 40px;
width: 5em;
margin: 0;
background-color: aqua;
-webkit-transition: -webkit-transform 1s linear;
}
</style>
<script type="text/javascript">
window.angel = 0;
window.timer;
function fold() {
var foldUp = document.getElementById("foldUp");
var foldDown = document.getElementById("foldDown");
var down = document.getElementById("down");
if (window.angel == 0) {
window.timer = setInterval(function() {
var diff = different(-1, 20);
console.log(foldUp.offsetTop)
move(foldUp, diff, 1);
move(foldDown, diff, 3);
move(down, diff, 4);
}, 40);
setTimeout(function() {
clearInterval(window.timer);
foldUp.style.top = "-20px";
foldDown.style.top = "-60px";
down.style.top = "-80px";
window.angel = -90;
}, 1030);
foldUp.style.webkitTransform = "rotateX(-90deg)";
foldDown.style.webkitTransform = "rotateX(90deg)";
} else if (angel == -90) {
window.timer = setInterval(function() {
var diff = different(1, 20);
console.log(foldUp.offsetTop)
move(foldUp, diff, 1);
move(foldDown, diff, 3);
move(down, diff, 4);
}, 40);
setTimeout(function() {
clearInterval(window.timer);
foldUp.style.top = "0";
foldDown.style.top = "0";
down.style.top = "0";
window.angel = 0;
}, 1030);
foldUp.style.webkitTransform = "rotateX(0deg)";
foldDown.style.webkitTransform = "rotateX(0deg)";
} else {
console.log(window.angel)
}
}
function positionValue(div, type) {// 得到css带单位的值
var str = div.style[type];
str = str.substring(0, str.length - 2);
var value = parseInt(str);
if (isNaN(value)) {
value = 0;
}
return value;
}
function move(div, different, time) {
var top = positionValue(div, "top");
div.style.top = top + different * time + "px";
}
function different(direction, height) {
var lastAngel = window.angel;
window.angel += 3.6 * direction;
var different = Math
.ceil((Math.cos(window.angel / 180 * Math.PI) - Math
.cos(lastAngel / 180 * Math.PI))
* height * 100) / 100;
return different;
}
</script>
</head>
<body>
<div id="wrapper">
<div id="up" class="paper">
g
</div>
<div id="foldUp" class="paper">
n
</div>
<div id="foldDown" class="paper">
b
</div>
<div id="down" class="paper">
t
</div>
</div>
<button onclick=fold();>
fold
</button>
</body>
</html>