装饰器 @HostListener

  @HostListener('mouseenter') onMouseEnter() {
    this.highlight(this.hight||'red');
  }

  @HostListener('mouseleave') onMouseLeave() {
    this.highlight(null);
  }
  private highlight(color: string) {
    this.el.nativeElement.style.backgroundColor = color;
  }
You can change the world with your heart,even a lot of changes sometimes unless you won't geiv up....
【推广】 免费学中医，健康全家人
原文地址：https://www.cnblogs.com/xiongwei2017/p/7076024.html