IE 異常"_doPostBack is undefined"

Web Server可能由於.Net 2 和.Net 4沒有正確安裝，導致IE10+的瀏覽器沒有被正確識別，這時需要改變Server的瀏覽器檔案：

1. 找到 ： 

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\Browsers

2. 開啟ie.browser檔案

添加：

<browser id="IE11Preview" parentID="Mozilla">    <identification>        <userAgent match="Trident/(?'layoutVersion'\d+).*rv:(?'revision'(?'major'\d+)(\.(?'minor'\d+)?))" />        <userAgent nonMatch="MSIE" />    </identification>    <capabilities>        <capability name="browser"              value="IE" />        <capability name="layoutEngine"         value="Trident" />        <capability name="layoutEngineVersion"  value="${layoutVersion}" />        <capability name="isColor"              value="true" />        <capability name="screenBitDepth"       value="8" />        <capability name="ecmascriptversion"    value="3.0" />        <capability name="jscriptversion"       value="6.0" />        <capability name="javascript"           value="true" />        <capability name="javascriptversion"    value="1.5" />        <capability name="w3cdomversion"        value="1.0" />        <capability name="ExchangeOmaSupported" value="true" />        <capability name="activexcontrols"      value="true" />        <capability name="backgroundsounds"     value="true" />        <capability name="cookies"              value="true" />        <capability name="frames"               value="true" />        <capability name="javaapplets"          value="true" />        <capability name="supportsCallback"     value="true" />        <capability name="supportsFileUpload"   value="true" />        <capability name="supportsMultilineTextBoxDisplay" value="true" />        <capability name="supportsMaintainScrollPositionOnPostback" value="true" />         <capability name="supportsVCard"        value="true" />        <capability name="supportsXmlHttp"      value="true" />        <capability name="tables"               value="true" />        <capability name="supportsAccessKeyAttribute"    value="true" />        <capability name="tagwriter"            value="System.Web.UI.HtmlTextWriter" />        <capability name="vbscript"             value="true" />        <capability name="revmajor"             value="${major}" />        <capability name="revminor"             value="${minor}" />    </capabilities></browser>

關於此問題的其他解決方案連結：

http://stackoverflow.com/questions/15273618/ie10-script5009-dopostback-is-undefined

http://www.hanselman.com/blog/BugAndFixASPNETFailsToDetectIE10CausingDoPostBackIsUndefinedJavaScriptErrorOrMaintainFF5ScrollbarPosition.aspx

http://stackoverflow.com/questions/19783852/asp-net-on-net-4-causing-ie11-throw-dopostback-is-undefined-javascript-error

http://stackoverflow.com/questions/18009636/crosspostback-ajax-controls-and-asp-net-generated-postbacks-work-for-net-4-5/19203518#19203518