Unexpected module 'BrowserModule' declared by the module 'AppModule'

Unexpected module ‘BrowserModule’ declared by the module ‘AppModule’

整体报错是:compiler.js:2175 Uncaught Error: Unexpected module ‘BrowserModule’ declared by the module ‘AppModule’. Please add a @Pipe/@Directive/@Component annotation.

把app.module和BrowserModule都翻了一遍,没发现什么问题.
之后查了很多网页,才发现.BrowserModule的位置放错了.它是一个’module’,而不是’component’,所以不应该被’declare’,而是该被’imports’;换一下位置就好了.

改之前:
Unexpected module 'BrowserModule' declared by the module 'AppModule'

改之后:
Unexpected module 'BrowserModule' declared by the module 'AppModule'

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