angular4,angular6中解决内层盒子到底外层盒子滚动

 //用来处理 里盒子滚完外盒子滚的问题
    scrollUnique(who){
        document.getElementsByClassName(who)[0].addEventListener('mousewheel',function($event:any){
            var scrollTop = this.scrollTop,
            scrollHeight = this.scrollHeight,
            height = this.clientHeight;
            var delta = ($event.wheelDelta) ? $event.wheelDelta : -($event.detail || 0);        
            if ((delta > 0 && scrollTop <= delta) || (delta < 0 && scrollHeight - height - scrollTop <= -1 * delta)) {
                // IE浏览器下滚动会跨越边界直接影响父级滚动，因此，临界时候手动边界滚动定位
                this.scrollTop = delta > 0? 0: scrollHeight;
                // 向上滚 || 向下滚
                event.preventDefault();
            }
        })
    }

　　没有做兼容和通用,自己改改即可用