效果如下图： 只需要在代码行ToolTip的内容重插入： <body> <form id="form1" runat="server"> <asp:Button ID="Button1" runat="server" CommandName="a1" OnCommand="Button2_Command" Text="Button" /> <asp:Button ID="Button2" runat="server" CommandName="a2" OnCommand="Button2_Command" Text="Button" /> <br /> <br /> <br /> <asp:Button ID="Button3" runat="server" OnClick="Button3_Click" Text="Button" ToolTip="11111111111111111111111 111111111111111111111111111" /> </form></body> 相关文章：