asp.net 项目在 IE 11 下出现 “__doPostBack”未定义 的解决办法

解决方法：

在项目根目录 App_Browsers 下新建 浏览器文件(.browser)，让其与IE11的 UserAgent 匹配，使 .net framework 认识这是一个已知的浏览器，可以正常地向客户端输出脚本。 
在文件里输入以下内容，保存即可。

<browsers>

     <browser id="IE11" parentID="Mozilla">

        <identification>

         <userAgent match="Trident\/7.0; rv:(?'version'(?'major'\d+)(\.(?'minor'\d+)?)(?'letters'\w*))(?'extra'[^)]*)" />

          <userAgent nonMatch="IEMobile" />

        </identification>

        <capture>

          <userAgent match="Trident/(?'layoutVersion'\d+)" />

       </capture>

       <capabilities>

         <capability name="browser"              value="IE" />

         <capability name="layoutEngine"         value="Trident" />

         <capability name="layoutEngineVersion"  value="${layoutVersion}" />

        <capability name="extra"                value="${extra}" />

        <capability name="isColor"              value="true" />

        <capability name="letters"              value="${letters}" />

         <capability name="majorversion"         value="${major}" />

         <capability name="minorversion"         value="${minor}" />

         <capability name="screenBitDepth"       value="8" />

         <capability name="type"                 value="IE${major}" />

         <capability name="version"              value="${version}" />

       </capabilities>

     </browser>

    

    <!-- Mozilla/5.0 (Windows NT 6.3; Trident/7.0; rv:11,0) like Gecko -->

    <browser id="IE110" parentID="IE11">

       <identification>

         <capability name="majorversion" match="11" />

       </identification>

    

       <capabilities>

        <capability name="ecmascriptversion"    value="3.0" />

        <capability name="jscriptversion"       value="5.6" />

        <capability name="javascript"           value="true" />

        <capability name="javascriptversion"    value="1.5" />

         <capability name="msdomversion"         value="${majorversion}.${minorversion}" />

         <capability name="w3cdomversion"        value="1.0" />

        <capability name="ExchangeOmaSupported" value="true" />

         <capability name="activexcontrols"      value="true" />

         <capability name="backgroundsounds"     value="true" />

         <capability name="cookies"              value="true" />

         <capability name="frames"               value="true" />

         <capability name="javaapplets"          value="true" />

         <capability name="supportsCallback"     value="true" />

         <capability name="supportsFileUpload"   value="true" />

         <capability name="supportsMultilineTextBoxDisplay" value="true" />

        <capability name="supportsMaintainScrollPositionOnPostback" value="true" />

        <capability name="supportsVCard"        value="true" />

        <capability name="supportsXmlHttp"      value="true" />

        <capability name="tables"               value="true" />

         <capability name="supportsAccessKeyAttribute"    value="true" />

         <capability name="tagwriter"            value="System.Web.UI.HtmlTextWriter" />

         <capability name="vbscript"             value="true" />

       </capabilities>

     </browser>

   </browsers>