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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<link rel="stylesheet" href="css/common.css" type="text/css" />
<title>显示/隐藏左侧导航栏</title>
</head>
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alert(window.parent.document.getElementById("myFrame").cols);
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<div /></a></div>
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