请麻烦帮忙看一下怎么回事
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
.my3dspace{
-webkit-perspective: 800;
-webkit-perspective-origin: 50% 50%;
overflow: hidden;
}
.pagegroup{
width: 400px;
height: 400px;
margin: 0 auto;
-webkit-transform-style: preserve-3d;
position: relative;
}
.page{
width: 360px;
height: 360px;
padding: 20px;
background-color: black;
color: white;
font-weight: bold;
font-size: 360px;
line-height: 360px;
text-align: center;
position: absolute;
}
#page1{
-webkit-transform-origin: bottom;
-webkit-transition: transform 1s linear;
}
#page2,#page3,#page4,#page5,#page6,{
-webkit-transform-origin: bottom;
-webkit-transition: transform 1s linear;
-webkit-transform: rotateX(90deg);
}
.op{
text-align: center;
margin: 40px auto;
}
</style>
<script type="text/javascript">
var curIndex =1;
function next(){
if(curIndex==6)
return;
var curPage = document.getElementById("page"+curIndex);
curPage.style.transform="rotateX(-90deg)";
curIndex ++;
var nextPage = document.getElementById("page"+curIndex);
nextPage.style.transform="rotateX(0deg)";
}
function prev(){
if(curIndex==1)
return;
var curPage = document.getElementById("page"+curIndex);
curPage.style.transform="rotateX(90deg)";
curIndex --;
var nextPage = document.getElementById("page"+curIndex);
nextPage.style.transform="rotateX(0deg)";
}
</script>
</head>
<body>
<div class="my3dspace">
<div class="pagegroup">
<div class="page" id="page1">1</div>
<div class="page" id="page2">2</div>
<div class="page" id="page3">3</div>
<div class="page" id="page4">4</div>
<div class="page" id="page5">5</div>
<div class="page" id="page6">6</div>
</div>
</div>
<div class="op">
<a href="javascript:next()">next</a> <a href="javascript:prev()">prev</a>
</div>
</body>
</html>
