如果在div的style中把visibility設為hidden則div隱藏，但是它會佔據空白空間，而如果設定成display：none則不佔據空白空間；
而visible="false"則div不返回在html中；下面是給出的代碼：運行一下就知道區別了。
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
aaa
</div>
<div style=" display:none;"><%--不佔據空白空間--%>
aaa
</div>
<div>
aaa
</div>
<div>
aaa
</div>
<div style="visibility:hidden"><%--佔據空白空間--%>
aaa
</div>
<div id="Div1" runat="server" visible="false">bbbbbbb</div>
<div>
aaa
</div>
<div id="Div2" runat="server" visible="false">bbbbbbb</div><%--在html中不存在--%>
</form>
</body>
</html>
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