系统默认default方式检测所有组件变更

缺点：数据更新占用内存太大

组件配置OnPush优化检测机制

import { ChangeDetectionStrategy, ChangeDetectorRef } from '@angular/core';@Component({selector: 'app-buybackv4',templateUrl: './buybackv4.component.html',styleUrls: ['./buybackv4.component.less'],changeDetection: ChangeDetectionStrategy.OnPush  //更改方式为once，优化性能 
}) export class MemberDetailComponent implements OnInit {constructor(private cd:ChangeDetectorRef ){}clickFn(){
this.cd.detectChanges();    //在需要的地方触发组件数据更新
}
}