chrome下的z-index问题
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style>
#my3dSpace {
-webkit-perspective: 800px;
-webkit-perspective-origin: 50% 50%;
overflow: hidden;
}
#pageGroup {
width: 800px;
height: 800px;
margin: 0 auto;
-webkit-transform-style: preserve-3d;
position: relative;
z-index: 100;
}
.page {
width: 360px;
height: 360px;
padding: 20px;
background-color: #2e6da4;
color: #eeeeee;
font-size: 360px;
font-weight: bold;
line-height: 360px;
text-align: center;
top: 150px;
position: absolute;
-webkit-transform-origin: right;
-webkit-transition: 1.5s linear;
}
.page:hover {
cursor: pointer;
}
</style>
</head>
<body>
<div id="my3dSpace">
<div id="pageGroup">
<div class="page" id="page5" onclick="flip('page5')">5</div>
<div class="page" id="page4" onclick="flip('page4')">4</div>
<div class="page" id="page3" onclick="flip('page3')">3</div>
<div class="page" id="page2" onclick="flip('page2')">2</div>
<div class="page" id="page1" onclick="flip('page1')">1</div>
</div>
</div>
<script>
var leftPage = 5,
rightPage = 0;
function flip(id) {
var page = document.getElementById(id);
//初始无rotate值，page向右翻页
if (page.style.webkitTransform == "") {
page.style.webkitTransform = "rotateY(180deg)";
rightPage++;
leftPage--;
page.style.zIndex = 1000+rightPage*100;
} //判断rotate值等于180度，page向左翻页
else if (page.style.webkitTransform == "rotateY(180deg)") {
page.style.webkitTransform = "rotateY(0deg)";
rightPage--;
leftPage++;
page.style.zIndex = 1000+leftPage*100;
} //判断rotate值等于0度，page向右翻页
else if (page.style.webkitTransform == "rotateY(0deg)") {
page.style.webkitTransform = "rotateY(180deg)";
rightPage++;
leftPage--;
page.style.zIndex = 1000+rightPage*100;
}
}
</script>
</body>
</html>为什么翻页到右边后，page5的z-index是1500，却被page1覆盖，但是点击时，是page5向左侧翻页，求大神帮解决下
