為什么我的代碼只顯示第一張一點next就白屏了。。。。

<script type="text/javascript">

var curIndex=1;

function next(){

var curPage = document.getElementById("page"+curIndex);

curPage.style.webkitTransform = "rotateX(-90deg)";

curIndex ++;

var nextPage = document.getElementById("page"+curIndex);

nextPage.style.webkitTransform ="rotateX(0deg)";

}

function prev(){

}