@angular/forms里有个接口用来实现支持[(ngModel)]，具体可查ControlValueAccessor，这边还未深入理解只是为了开发组件而初步了解
interface ControlValueAccessor {
writeValue(obj: any): void
registerOnChange(fn: any): void
registerOnTouched(fn: any): void
...
}
我们要做的事就是实现这个接口
import {NG_VALUE_ACCESSOR,ControlValueAccessor} from "@angular/forms"
@Component({
selector: ‘app-search-select‘,
templateUrl: ‘./search-select.component.html‘,
styleUrls: [‘./search-select.component.less‘],
providers: [{
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => SearchSelectComponent),
multi: true
}]
})
原文：https://www.cnblogs.com/llcMite/p/11449516.html