关于echarts图表全屏与缩放按钮 功能的实现

全屏按钮实现：

let element = document.getElementById("container")
if(element.requestFullscreen){
	element.requestFullscreen()
	document.getElementById("container").style.position = "absolute"
}

element.requestFullscreen()可实现全屏，position = "absolute"解决esc退出全屏后图表外的容器错位与无背景色的问题

缩放按钮实现
首先在图表series里定义zoom:1 roam:true
添加 监听graphroam：

this.graphEchart.on('graphroam',function(params){
	if('zoom' in params){
		if(params.zoom > 1){
			this.zoom += 0.2
		}else{
			this.zoom -= 0.2
		}
	}
})

添加放大按钮事件：

this.zoom += 0.2
this,option.series[0].zoom = this.zoom
this.graphEchart.setOption(this.zoom)

添加缩小按钮事件：

this.zoom -= 0.2
this,option.series[0].zoom = this.zoom
this.graphEchart.setOption(this.zoom)