这个JavaScript如何改播放器的尺寸？
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Music Player - CodePen</title>
<link rel="stylesheet" href="css/reset.css">
<link rel="stylesheet" href="css/style.css" media="screen" type="text/css" />
</head>
<body>
<div class="music-player">
<!--<div style="background-image: url(http://i.imgur.com/yqB0erk.jpg);" class="album"></div>-->
<div class="info">
<div class="left">
<a href="javascript:;" class="icon-shuffle"></a>
<a href="javascript:;" class="icon-heart"></a>
</div>
<div class="center">
<div class="jp-playlist">
<ul>
<li></li>
</ul>
</div>
</div>
<div class="right">
<a href="javascript:;" class="icon-repeat"></a>
<a href="javascript:;" class="icon-share"></a>
</div>
<div class="progress jp-seek-bar">
<span class="jp-play-bar" style="width: 0%"></span>
</div>
</div>
<div class="controls">
<div class="current jp-current-time">00:00</div>
<div class="play-controls">
<a href="javascript:;" class="icon-previous jp-previous" title="previous"></a>
<a href="javascript:;" class="icon-play jp-play" title="play"></a>
<a href="javascript:;" class="icon-pause jp-pause" title="pause"></a>
<a href="javascript:;" class="icon-next jp-next" title="next"></a>
</div>
<div class="volume-level jp-volume-bar">
<span class="jp-volume-bar-value" style="width: 0%"></span>
<a href="javascript:;" class="icon-volume-up jp-volume-max" title="max volume"></a>
<a href="javascript:;" class="icon-volume-down jp-mute" title="mute"></a>
</div>
</div>
<div id="jquery_jplayer" class="jp-jplayer"></div>
</div>
<script src="js/jquery.min.js"></script>
<script src="js/jquery.jplayer.min.js"></script>
<script src="js/jplayer.playlist.min.js"></script>
<script src="js/index.js"></script>
</body>
</html>
代码不全，不知道你的播放器怎么做的，如果是flash/wmp控件，直接改变width height就可以了。
用IE F12看下css，定位到播放器，然后照着修改。
jplayer可以设置width，height的，你是不是配置为100%了
http://www.jplayer.org/latest/developer-guide/#jPlayer-option-size