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<script language="javascript" type="text/javascript">
function btnonclick() {
var txt = document.getElementById("TextBox1").value;
if (txt == "123") {
return confirm('确定执行?');
}
else {
return true;
}
}
</script>
<body>
<form runat="server" id="form1">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" OnClientClick="btnonclick();" />
</form>
</body>