Angular 5 NullInjectorError：没有n的提供者 [英] Angular 5 NullInjectorError: No provider for n

问题描述

当我使用 ng服务启动我的网站时，一切正常，但每次尝试启动生产都会收到错误 NullInjectorError：No provider对于n 。我检查了我写的所有服务都包含在NgModule提供程序中。因为这是生产，所有文件都被缩小和丑化，所以我不知道究竟是什么导致了问题。有没有办法检查它或者可能从错误详细信息中获取？

When I'm starting my website with ng serve everything works fine, but every try to launch a production getting an error NullInjectorError: No provider for n. I checked all services that I wrote are included in NgModule providers. Because this is the production, all files are minified and uglified, so I don't know what exactly cause the problem. Is there any way to check it or maybe it's possible to get from the error details?

ERROR Error: StaticInjectorError(G)[n -> n]: 
StaticInjectorError(Platform: core)[n -> n]: 
NullInjectorError: No provider for n!
at n.get (main.94f42881e2fdceca85d7.bundle.js:1)
at main.94f42881e2fdceca85d7.bundle.js:1
at n (main.94f42881e2fdceca85d7.bundle.js:1)
at n.get (main.94f42881e2fdceca85d7.bundle.js:1)
at main.94f42881e2fdceca85d7.bundle.js:1
at n (main.94f42881e2fdceca85d7.bundle.js:1)
at n.get (main.94f42881e2fdceca85d7.bundle.js:1)
at Pi (main.94f42881e2fdceca85d7.bundle.js:1)
at main.94f42881e2fdceca85d7.bundle.js:1
at Li (main.94f42881e2fdceca85d7.bundle.js:1)

推荐答案

这可能是由于 JIT （即时）和 AOT 的差异（提前）编译器。请在文档中了解详情。

This is probably due to the differences of JIT (just-in-time) and AOT (ahead-of-time) compiler. Read more about this in the docs.

如果你运行 ng服务或 ng build 它将使用 JIT 默认情况下。但是，使用 - prod 标志，使用 AOT 。

If you run ng serve or ng build it will use JIT by default. With the --prod flag however, AOT is used.

尝试运行 ng serve --aot 或 ng serve --prod 以查看更易于理解的错误消息。由于这不再慢，我建议在开发过程中始终使用 - aot 标志。你会更早地看到问题。

Try running ng serve --aot or ng serve --prod to see a more comprehensible error message. Since this is not much slower any more, I'd recommend always using the --aot flag during development. You will see problems much earlier.

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