拖动一个ScriptMange，出现了“Microsoft JScript runtime error: 'Sys' is undefined”的错误的解决方案：
在 web.config-->system.web配置节添加
<httpHandlers> <remove verb="*" path="*.asmx"/>
<add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory"/>
<add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler,
System.Web.Extensions, Version=1.0.61025.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35" validate="false"/>
</httpHandlers>
