Angular中使用better-scroll插件的方法

<div class="scroll" #scroll>
 <ng-content></ng-content>
</div>

import { Component, OnInit, Input, ElementRef, ViewChild } from '@angular/core';
declare let BScroll;
@Component({
 selector: 'app-listscroll',
 templateUrl: './listscroll.component.html',
 styleUrls: ['./listscroll.component.css']
})
export class ListscrollComponent implements OnInit {

 @ViewChild('scroll') scrollEl: ElementRef;
 @Input()
 private height: number;

 public scroll;
 constructor() { }

 ngOnInit() {
 
  // 设置高度
  this.scrollEl.nativeElement.style.height = `${this.height}px`; 
  
  // 初始化
  setTimeout(() => {
   this.scroll = new BScroll(this.scrollEl.nativeElement, {click: true});
  }, 20);
 }

}

<app-listscroll [height]="height">
 <ul>
   <li class="item" *ngFor="let item of list; let num = index;">第{{num}}个</li>
 </ul>
</app-listscroll>