angular-docs-cn/modules/@angular/compiler/src/directive_lifecycle_reflect...

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TypeScript

import {OnInit, OnDestroy, DoCheck, OnChanges, AfterContentInit, AfterContentChecked, AfterViewInit, AfterViewChecked,} from '@angular/core';
import {reflector, LifecycleHooks} from '../core_private';
import {Type} from '../src/facade/lang';
import {MapWrapper} from '../src/facade/collection';
const LIFECYCLE_INTERFACES: Map<any, Type> = MapWrapper.createFromPairs([
[LifecycleHooks.OnInit, OnInit],
[LifecycleHooks.OnDestroy, OnDestroy],
[LifecycleHooks.DoCheck, DoCheck],
[LifecycleHooks.OnChanges, OnChanges],
[LifecycleHooks.AfterContentInit, AfterContentInit],
[LifecycleHooks.AfterContentChecked, AfterContentChecked],
[LifecycleHooks.AfterViewInit, AfterViewInit],
[LifecycleHooks.AfterViewChecked, AfterViewChecked],
]);
const LIFECYCLE_PROPS: Map<any, string> = MapWrapper.createFromPairs([
[LifecycleHooks.OnInit, 'ngOnInit'],
[LifecycleHooks.OnDestroy, 'ngOnDestroy'],
[LifecycleHooks.DoCheck, 'ngDoCheck'],
[LifecycleHooks.OnChanges, 'ngOnChanges'],
[LifecycleHooks.AfterContentInit, 'ngAfterContentInit'],
[LifecycleHooks.AfterContentChecked, 'ngAfterContentChecked'],
[LifecycleHooks.AfterViewInit, 'ngAfterViewInit'],
[LifecycleHooks.AfterViewChecked, 'ngAfterViewChecked'],
]);
export function hasLifecycleHook(hook: LifecycleHooks, token: any /** TODO #9100 */): boolean {
var lcInterface = LIFECYCLE_INTERFACES.get(hook);
var lcProp = LIFECYCLE_PROPS.get(hook);
return reflector.hasLifecycleHook(token, lcInterface, lcProp);
}