问题描述：
'ion-col' is not a known element:
- If 'ion-col' is an Angular component, then verify that it is part of this module.
- If 'ion-col' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
解决办法：
1.components.module.ts文件中引入IonicModule.
import { IonicModule } from 'ionic-angular';
2.components.module.ts中装饰器(@NgModule)中的导入IonicModule.
@NgModule({
...
imports: [IonicModule],
...
})
转载自：(https://www.jianshu.com/p/ac9000aa1988](https://www.jianshu.com/p/ac9000aa1988)
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