<app-scroll-up [dataObj]="dataObjUp">
  <div class="slot-one">
    <div [style]="{  height: dataObjUp.height + dataObjUp.unit }" class="inner_item"
      *ngFor="let item of dataObjUp.scrollList,index as i">
      内容：{{ item }}介绍：我是嵌入的slot{{ i+1 }}，相当于vue的slot
    </div>
  </div>
  <div class="slot-two">
    <div [style]="{ height: dataObjUp.height + dataObjUp.unit }" class="inner_item">
      {{ dataObjUp.scrollList[0] }}嵌入的slot2，这里要放和 slot1里面第一个画面一模一样的东西
    </div>
  </div>
</app-scroll-up>



dataObjUp = {
    time: 50,
    minLength: 1,
    width:200,
    height: 200,
    unit: 'px',
    scrollList: ['1111','2222','3333','444','555','666']
  }



<div class="scroll_outermost_up" [style]="{ width: dataObj.width + dataObj.unit, height: dataObj.height + dataObj.unit }"
  #outerMost (mouseover)="rollStop('over')" (mouseout)="rollStart(60)">
  <div class="outer_box" #outerBox1>
    <ng-content select=".slot-one"></ng-content>
  </div>
  <div class="outer_box" #outerBox2>
    <ng-content select=".slot-two"></ng-content>
  </div>
</div>




import { Component, ElementRef, OnInit, Input, ViewChild, ViewEncapsulation } from '@angular/core';

@Component({
  selector: 'app-scroll-up',
  templateUrl: './scroll-up.component.html',
  styleUrls: ['./scroll-up.component.less'],
  encapsulation: ViewEncapsulation.Emulated,
})
export class ScrollUpComponent implements OnInit {

  constructor() { }

  ngOnInit(): void {
  }

  @Input()
  public dataObj: any = {
    time: 50,
    minLength: 1,
    width:200,
    height: 200,
    unit: 'px',
    scrollList: ['1111','2222','3333','444','555','666']
  }

  @ViewChild('outerMost', { static: false }) outerMost: ElementRef;
  @ViewChild('outerBox1', { static: false }) outerBox1: ElementRef;
  @ViewChild('outerBox2', { static: false }) outerBox2: ElementRef;

  ngAfterViewInit() {
    setTimeout(()=>{this.roll(this.dataObj.time)},1000)
  }
  timer = null
  ngOnDestroy() {
    if (this.timer) clearInterval(this.timer);
  }
  roll(t) {
    var outerMost = this.outerMost.nativeElement
    if (this.dataObj.scrollList.length < this.dataObj.minLength) { return console.log('不需要滚动') }
    outerMost.scrollTop = 0;
    this.rollStart(t);
  }
  rollStart(t) {
    var outerMost = this.outerMost.nativeElement
    var outerBox1 = this.outerBox1.nativeElement
    this.rollStop('开始');
    this.timer = setInterval(() => {
      // 当滚动高度大于列表内容高度时恢复为0
      outerMost.scrollTop++;
      if (outerBox1.scrollHeight - outerMost.scrollTop === 1) {
        outerMost.scrollTop = 0;
        outerMost.scrollTop++;
      }
      if (outerMost.scrollTop >= outerBox1.scrollHeight) {
        outerMost.scrollTop = 0;
        outerMost.scrollTop++;
      }
    }, t);
  }
  rollStop(e) {
    console.log(e)
    clearInterval(this.timer);
  }

}



.scroll_outermost_up {
  overflow: hidden; /* 必须 */
  cursor: pointer;
  .outer_box {
    /deep/.inner_item {
      background-color: rgb(235, 210, 243);
    }
    /deep/.inner_item:nth-child(odd) {
      background-color: rgb(179, 223, 248);
    }
  }
}