html5菜单折纸效果

前端技术 2023/09/01 HTML

类似猎豹浏览器安装时的用户须知效果。

点击后效果



复制代码
代码如下:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\">
<title>fold paper effect by gt-柯乐义</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>

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