该问题与Angular 8有关。
我有一个在IIS上运行的网站，其代码在. Net和AngularJs 1.6中显示为www.parent.com
And I am building a completely new website in pure Angular 8 (single page application), currently having some of the pages of www.parent.com project. Also I have to run them both on the same domain. So I am trying to host the new website in a virtual directory.
我尝试的是：
1.创建了虚拟目录，例如**/v2**
1.使用ng build --base-href "/v2" --deploy-url "/v2/"构建Angular8项目，并将dist复制到**/v2目录中
1.尝试访问www. parent. com/v2/**
一切都运行良好，导航到不同的页面等。路由在Angular8项目上运行良好，例如-www. parent. com/v2/timestule、www. parent. com/v2/noticeboard
但当我在其中一个页面从子项目和刷新页面它给出了以下错误

HTTP Error 404.0 - Not Found
The resource you are looking for has been removed, had its name changed, or is temporarily unavailable.

Most likely causes:
The directory or file specified does not exist on the Web server.
The URL contains a typographical error.
A custom filter or module, such as URLScan, restricts access to the file.

Things you can try:
Create the content on the Web server.
Review the browser URL.
Create a tracing rule to track failed requests for this HTTP status code and see which module is calling SetStatus. For more information about creating a tracing rule for failed requests, click here.

Detailed Error Information:
Module     IIS Web Core
Notification       MapRequestHandler
Handler    StaticFile
Error Code     0x80070002
Requested URL      http://parent.com:80/Child/timetable/worker
Physical Path      D:\WebSites\Child\timetable\worker
Logon Method       Anonymous
Logon User     Anonymous

更新：
1.按此添加web. config
1.在angular 8项目的index.html中添加
目录结构：
C：\web\项目\父级-〉. net项目
C：\web\v2-〉Angular 8项目
IIS中名为v2的虚拟目录指向C：\web\v2

• • C：\网页\v2\源代码\网页配置**：

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
   <system.webServer>
      <directoryBrowse enabled="true" />
      <rewrite>
         <rules>
            <rule name="AngularJS Routes" stopProcessing="true">
               <match url=".*" />
               <conditions logicalGrouping="MatchAll">
                  <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                  <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
                  <add input="{REQUEST_URI}" pattern="^/(api)" negate="true" />
               </conditions>
               <action type="Rewrite" url="/v2" />
            </rule>
         </rules>
      </rewrite>
   </system.webServer>
</configuration>