vue+element 监听某个div的变化，然后执行相应的事件

1.安装 element-resize-detector

npm install element-resize-detector

2.引入elementResizeDetectorMaker

import elementResizeDetectorMaker from 'element-resize-detector'

3.使用

mounted() {  
    this.erd = elementResizeDetectorMaker()
    this.erd.listenTo(this.$refs.middle.$el, this.chartResize)
  },
methods:{
chartResize(){
	//do Something
}
}