<!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></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<input type="text" onkeyup="textChanged(this)" onchange="textChanged(this)" runat="server" id="YourTextBox" />
</div>
<script type="text/javascript">
function textChanged(o) {
if (event.keyCode == 13) {
var win = window.open("", "_blank");
win.document.writeln("Hello World!");
}
}
</script>
</form>
</body>
</html>
或者：
<asp:TextBox ID="TextBox1" runat="server" onkeyup="textChanged(this)"></asp:TextBox> 来替代<input type="text" onkeyup="textChanged(this)" onchange="textChanged(this)" runat="server" id="YourTextBox" />