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fix: typo

This commit is contained in:
Zhicheng Wang 2018-08-23 14:39:30 +08:00
parent a43beabdb7
commit 2721708915
1 changed files with 2 additions and 2 deletions
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4
aio/content/guide/dependency-injection.md
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@ -1199,10 +1199,10 @@ the `HeroesComponent` in the same file,
If you define the component before the service, If you define the component before the service,
you'll get a runtime null reference error. you'll get a runtime null reference error.
如果你把 `HeroService` 和 `HeroesComponent` 组合在同一个文件里， 如果你要把 `HeroService` 和 `HeroesComponent` 组合在同一个文件里，
**就得把组件定义放在最后面！** **就得把组件定义放在最后面！**
如果把组件定义在了服务的前面， 如果把组件定义在了服务的前面，
在运行时抛出空指针错误。 在运行时它就会抛出空指针错误。
<div class="alert is-helpful"> <div class="alert is-helpful">