<!DOCTYPE html><html><head>?<meta charset="utf-8">?<style type="text/css">?body{margin: 0;background:#333;}?ul{margin: 0;padding: 0;}?li{list-style: none;}?#pic{width: 400px;height:500px;position:relative;margin: 0 auto;}?#pic img{width: 400px;height:500px;}?#pic ul{position: absolute;top:0;right: -50px;}?#pic li{width: 40px;height: 40px;margin-bottom: 4px;background:#666;}?#pic .active{background:yellow; }?#pic p,#pic span{width: 400px;height: 30px;line-height: 30px;color:red;position: absolute;left:0;text-align: center;}?#pic span{top: 0;}?#pic p{bottom: 0;}?</style>?<script type="text/javascript">?</script></head><body>?<div id="pic">??<img src="C:/Users/馮新星/Desktop/Saved Pictures/pic.jpg"/>??<span>數(shù)據(jù)加載中</span>??<p>圖片加載中</p>??<ul>???<li class="active"></li>???<li></li>???<li></li>???<li></li>??</ul>?</div></body></html>為什么我代碼定位的是在父元素的left:0;處，顯示的卻是在水平居中位置呢？
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