如何将变量传递到指令中？

<app-custom-directive [variable]="myVariable"></app-custom-directive>

@Directive({
  selector: '[appCustomDirective]'
})
export class CustomDirective {
  @Input() variable: any;
}

@Directive({
  selector: '[appCustomDirective]'
})
export class CustomDirective {
  constructor(private myService: MyService) {}

  someMethod() {
    const variable = this.myService.getVariable();
    // 使用变量进行操作
  }
}

@Directive({
  selector: '[appCustomDirective]'
})
export class CustomDirective {
  constructor(private elementRef: ElementRef) {}

  ngOnInit() {
    const variable = this.elementRef.nativeElement.getAttribute('data-variable');
    // 使用变量进行操作
  }
}