Angular 中的过渡

# 利用 Angular 过渡实现平滑动画效果

bash
npm install --save @angular/animations

typescript
// app.module.ts
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
@NgModule({
  imports: [BrowserAnimationsModule],
  // other configurations
})
export class AppModule { }

html
切换状态
  状态变化的元素

typescript
// app.component.ts
import { Component } from '@angular/core';
import { trigger, state, style, animate, transition } from '@angular/animations';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css'],
  animations: [
    trigger('fadeInOut', [
      state('in', style({ opacity: 1 })),
      state('out', style({ opacity: 0 })),
      transition('in => out', animate('500ms ease-out')),
      transition('out => in', animate('500ms ease-in'))
    ])
  ]
})
export class AppComponent {
  state = 'in';
  toggleState() {
    this.state = this.state === 'in' ? 'out' : 'in';
  }
}