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使用Regex：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default3.aspx.cs" Inherits="Default3" %>
<!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>
<script type="text/javascript">
function show()
{
var strValue="this is a string without space"
window.alert(strValue.replace(/\s+/g, ''));
}
</script>
</head>
<body onload="show();">
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
</html>
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