TextBox控件文本默认内容当文本获得焦点的时候清空内容。

     

<asp:TextBox ID="VotesNoTextBox" runat="server" Text="多个票号请用“,”逗号隔开。" Style="width: 80%;                                                            color: Gray" CssClass="inputcss" οnfοcus="cls()" οnblur="res()" TextMode="MultiLine"></asp:TextBox>

 

   function cls() {            var obj = window.event.srcElement;            obj.style.color = '#000';            with (event.srcElement)                if (value == defaultValue) value = ""            }

function res() {                var obj = window.event.srcElement;                obj.style.color = 'Gray';                with (event.srcElement)                    if (value == "") value = defaultValue        }