Angular コンポーネントの対話方法に関する簡単な説明

import { Component, Input } from '@angular/core';

@Component({
  selector: 'app-selector',
  template: `
    // 模板代码
  `
})
export class TestComponent {
  @Input() hero: Hero;
  @Input('master') masterName: string;
}

    <app-hero-child *ngFor="let hero of heroes"
      [hero] = "hero"
      [master] = "master">
    </app-hero-child>

export class TestComponent {
	
	@Input()
	set name(name: String) {
		// 逻辑处理
	}
}

import { Component, Input, OnChanges, SimpleChange } from '@angular/core';

@Component({
  selector: 'app-version-child',
  template: `
  // 模板代码
  `
})
export class ChildComponent implements OnChanges {
  @Input() major: number;
  @Input() minor: number;

  ngOnChanges(changes: { [propKey: string]: SimpleChange }) {
    for (let propName in changes) {
      // propName为输入属性的名字
      let changedProp = changes[propName]; // changedProp为SimpleChange对象
      // 其它代码
    }
  }
}

/**
 * Represents a basic change from a previous to a new value for a single
 * property on a directive instance. Passed as a value in a
 * {@link SimpleChanges} object to the `ngOnChanges` hook.
 *
 * @see `OnChanges`
 *
 * @publicApi
 */
export declare class SimpleChange {
    previousValue: any;
    currentValue: any;
    firstChange: boolean;
    constructor(previousValue: any, currentValue: any, firstChange: boolean);
    /**
     * Check whether the new value is the first value assigned.
     */
    isFirstChange(): boolean;
}