解决 aspx 页面 TextBox 不支持 type="number"

安装 framework 4 并且打上补丁

Microsoft .NET Framework 4 可靠性更新 1 (KB2533523)

<!-- this HTML tested in each .NET version -->
<asp:TextBox runat="server" type="number" />
Here are the results:

<!-- ASP.NET 2.0, 3.0, and 3.5 -->
<input name="ctl01" type="text" type="number" />

<!-- ASP.NET 4.0 and 4.5 -->
<input name="ctl01" type="number" />