图片缩放中心

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>图片放大居中</title>
<meta name="description" content="">
<meta name="keywords" content="">
<style>
	*{margin:0; padding:0;}
    ul,li{margin-right: 0; padding:0;}
    li{list-style:none;}
    a{text-decoration: none;}
    .clearfix:before,.clearfix:after{display: table; content: "";}  
    .clearfix:after{overflow: hidden; clear: both;}
    .clearfix{zoom:1;}
    body{ 100%; height: 100%; background-color: #000; overflow:hidden;}
    #box{330px; margin:100px auto; position: relative;}
    #box li{100px; height:100px; background:red; margin:10px 10px 0 0; float:left; color:#fff; line-height:24px;}
</style>
</head>
<body>
<ul id="box" class="clearfix">
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
    <li></li>
</ul>
<script src="js/app/move.js"></script>
<script>
    window.onload = function(){
        var aLi = document.getElementById('box').getElementsByTagName('li');
        var arr = [];
        var i=0;
        var zIndex = 1;

        for(i=0; i<aLi.length; i++){
            aLi[i].innerHTML = 'left：'+aLi[i].offsetLeft + 'px' + '<br>top：'+ aLi[i].offsetTop + 'px';
            arr.push({left:aLi[i].offsetLeft,top:aLi[i].offsetTop});
        }

        for(i=0; i<aLi.length; i++){
            aLi[i].index = i;
            aLi[i].style.left = arr[i].left + 'px';
            aLi[i].style.top = arr[i].top + 'px';
            aLi[i].style.position ='absolute';
            aLi[i].style.margin = 0;

            aLi[i].onmouseover = function(){
                this.style.background = 'green';
                this.style.zIndex=zIndex++;
                startMove(this,{
                    200,
                    height:200,
                    left:arr[this.index].left - 50,
                    top:arr[this.index].top - 50
                });
            }
            aLi[i].onmouseout = function(){
                this.style.background = 'red';
                startMove(this,{
                    100,
                    height:100,
                    left:arr[this.index].left,
                    top:arr[this.index].top
                });
            }
        }

    }
</script>
</body>
</html>