关于百度地图 MapGL 视角移动函数 centerAndZoom 完成后触发事件

// 变化可视区域 替代掉centerAndZoom
    changeBounds (param: { center: number[], zoom: number, onAfter?: Function, isNoOnChange?: boolean }){
        let isMove = false;
        const animation_start = function(){ isMove = true; };
        const animation_end = function(){ after(); };
        let onzoomend = {};
        // 是否禁止响应地图
        if( param.isNoOnChange === true ){
            onzoomend = this.map._listeners.onzoomend;
            this.map._listeners.onzoomend = {};
        }
        const after = ()=>{ 
            this.boundsChange((res: any)=>{
                param.onAfter && param.onAfter(res);
            }, false);
            if( param.isNoOnChange === true ){
                setTimeout(()=> this.map._listeners.onzoomend = onzoomend, 10);
            }
            this.map.off("animation_start", animation_start);
            this.map.off("animation_end", animation_end);    
        }
        this.map.on("animation_start", animation_start);
        this.map.on("animation_end", animation_end);
        const p = new BMapGL.Point(param.center[0], param.center[1]);
        this.map.centerAndZoom(p, param.zoom);
        if( isMove == false ){
            after();
        }
    }