在Vue中实现监听dom节点宽高变化

原生js方法

该方法适用所有vue项目，原生js开发的思维

	<div ref="datas">
			<div class="scroll_box" ref="scroll" style="width:20%;height: 20%;overflow:scroll;position: absolute;left: 0;top: 0;background-color: #000;">
			          <div class="scroll_child" style="width:300%;height: 300%;"></div>
			</div>
	      <div class="scroll_box2" ref="scroll2" style="width:20%;height: 20%;overflow:scroll;position: absolute;left: 0;top: 0;background-color: #000;">
	          <div class="scroll_child" style="width:300px;height: 300px;"></div>
	      </div>
	</div>

mounted(){
		// 监听节点宽高变小
		(this.$refs.scroll as HTMLElement).scrollTop = 1000;
        (this.$refs.scroll as HTMLElement).scrollLeft = 1000;
        (this.$refs.scroll as HTMLElement).addEventListener('scroll', () => {
            this.width = ((this.$refs.datas as Vue).$el as HTMLElement).offsetWidth;
            (this.$refs.scroll2 as HTMLElement).scrollTop = 1000;
            (this.$refs.scroll2 as HTMLElement).scrollLeft = 1000;
        });
        
		// 监听节点宽高变大
        (this.$refs.scroll2 as HTMLElement).scrollTop = 1000;
        (this.$refs.scroll2 as HTMLElement).scrollLeft = 1000;
        (this.$refs.scroll2 as HTMLElement).addEventListener('scroll', () => {
            this.width = ((this.$refs.datas as Vue).$el as HTMLElement).offsetWidth;
            (this.$refs.scroll as HTMLElement).scrollTop = 1000;
            (this.$refs.scroll as HTMLElement).scrollLeft = 1000;
        })
}

element-ui element-resize-detector插件

vue + element 开发项目时的首选，简单有效

<div ref="datas"></div>

mounted(){
	    let erd = elementResizeDetectorMaker();
        erd.listenTo((this.$refs.datas as Vue).$el,  (element: HTMLElement) => {
            this.width = element.offsetWidth;
        })
}