文本框 禁止粘贴

     function fncKeyStop(evt)
        {
            if(!window.event)
            {
                var keycode = evt.keyCode;
                var key = String.fromCharCode(keycode).toLowerCase();
                if(evt.ctrlKey && key == "v")
                {
                  evt.preventDefault();
                  evt.stopPropagation();
                }
            }
        }

 

 

<asp:TextBox ID="txtSpec" runat="server" CssClass="EditTextBox" Width="367px" onkeydown="fncKeyStop(event)" onpaste="return false" oncontextmenu = "return false;"></asp:TextBox>