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<html xmlns="http://www./1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<script>
function qh()
{
if (document.getElementById("div1").style.display=="none")
{
document.getElementById("div1").style.display="";
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<body>
<input type="button" value="切换" onclick="qh()" />
<div style="width:200px; height:800px; float:left; background:#000;"></div>
<div id="div1" style="width:200px; height:800px; float:left; background:#060;"></div>
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</body>
</html>
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