1. 确认已经正确引入了Bootstrap Multiselect库和相应的CSS样式：

2. 在Angular组件中引入并初始化Bootstrap Multiselect：

import {Component, ElementRef, OnInit, ViewChild} from "@angular/core";

declare var $: any; // 引入jQuery

@Component({
  selector: 'app-multiselect',
  templateUrl: './multiselect.component.html'
})

export class MultiselectComponent implements OnInit {
  @ViewChild('multiselect') elem: ElementRef;

  ngOnInit() {
    let options = {
      includeSelectAllOption: true,
      enableFiltering: true,
      maxHeight: 120
    };
    $(this.elem.nativeElement).multiselect(options);
  }
}

3. 在HTML模板中添加multiselect的HTML元素和必要的配置选项：

  
  Option 1  
  Option 2  
  Option 3  

4. 在组件销毁的时候，需要手动销毁multiselect这个实例，否则会出现内存泄漏的问题：

import {Component, ElementRef, OnDestroy, ViewChild} from "@angular/core";

declare var $: any; // 引入jQuery

@Component({
  selector: 'app-multiselect',
  templateUrl: './multiselect.component.html'
})

export class MultiselectComponent implements OnInit, OnDestroy {
  @ViewChild('multiselect') elem: ElementRef;

  ngOnInit() {
    let options = {
      includeSelectAllOption: true,
      enableFiltering: true,
      maxHeight: 120
    };
    $(this.elem.nativeElement).multiselect(options);
  }
  
  ngOnDestroy() {
    $(this.elem.nativeElement).multiselect('destroy');
  }
}