cesium 同步多个地图

我们经常需要对多个地图进行联动 分别展示，

对于cesium 的多屏联动 我们用typescript 实现

```javascript

export class LinkageMap{

private viewers:Array;

private focusIndex=0;

constructor(_viewers:Array){

super();

this.viewers = _viewers;

}

sync(focusIndex=0){

this.focusIndex= focusIndex;

this.viewers[0].scene.postRender.addEventListener(this.syncMapEventHandle, this);

for(let index =0;index {

this.focusIndex = index;

}

}

}

cancelSync(){

this.viewers[0].scene.postRender.removeEventListener(this.syncMapEventHandle, this);

for(let index =0;index

const viewer= this.viewers[index];

viewer.container.onmouseenter = null;

}

}

private syncMapEventHandle(){

 更多参考 https://xiaozhuanlan.com/topic/3879512640