In my case, same error was coming with JSP. This is how I got to the root of this issue: I went to the Network tab and clearly saw that the browser request to fetch the css was returning response header having "Content-type" : "text/html". I opened another tab and manually hit the request to fetch the css. It ended up returning a html log in form. Turns out that my web application had a url mapping for path = / Tomcat servlet entry : (@WebServlet({ "/, /index", }). So, any unmatching request URLs were somehow being matched to / and the corresponding servlet was returning a Log in html form. I fixed it by removing the mapping to /

此外，tomcat配置wrt处理css MIME-TYPE已经存在。

答案可以在上面给出。我也遇到过同样的问题，但无法解决。确保添加外部js文件为

<script src="main.js"></script>

我也遇到过类似的问题。在这个奇妙的Stack Overflow页面中探索解决方案。

user54861的响应(大小写不匹配的名字)让我很好奇，再次检查我的代码，并意识到“我没有上传两个js文件，我在头标签中加载了它们”。: -)

当我上传他们的问题跑了!并且代码运行和页面呈现没有任何其他错误!

所以，这个故事的寓意是，不要忘记确保你所有的js文件都上传到了页面需要它们的地方。

我在MVC4中使用表单身份验证时遇到了类似的问题。问题出在web。config中的这一行，

<modules runAllManagedModulesForAllRequests="true">

这意味着每个请求，包括静态内容的请求，都要经过身份验证。

将这一行更改为:

<modules runAllManagedModulesForAllRequests="false">

根据其他的回答，这条消息似乎有很多原因，我想我只是分享我的个人解决方案，以防将来有人有我的确切问题。

Our site loads the CSS files from an AWS Cloudfront distribution, which uses an S3 bucket as the origin. This particular S3 bucket was kept synced to a Linux server running Jenkins. The sync command via s3cmd sets the Content-Type for the S3 object automatically based on what the OS says (presumably based on the file extension). For some reason, in our server, all the types were being set correctly except .css files, which it gave the type text/plain. In S3, when you check the metadata in the properties of a file, you can set the type to whatever you want. Setting it to text/css allowed our site to correctly interpret the files as CSS and load correctly.

使用的反应

我在我的react profile应用程序中遇到了这个错误。我的应用程序表现得有点像它试图引用一个不存在的url。我相信这与webpack的行为有关。

如果你在公用文件夹中链接文件，你必须记住在资源之前使用%PUBLIC_URL%，就像这样:

<link type="text/css" rel="stylesheet" href="%PUBLIC_URL%/bootstrap.min.css" />