arcgis point 随着 line类型的轨迹运动的动画

        animate : function(frampoint,topoint,speed = 60){

            var path = topoint.geometry.paths[0];

            var i = 1;

            var pathTimer = function(){

                //帧数

                var zs = 1;

                var

                //获取经度

                lon = frampoint.geometry.x,

                //获取纬度

                lat = frampoint.geometry.y;

                //开始计算差值

                _lon = (lon - path[i][0])/60;

                _lat = (lat - path[i][1])/60;

                //保持一分钟60次变化帧数

                var zstimer = setInterval(function(){

                    frampoint.geometry.x -= _lon;

                    frampoint.geometry.y -= _lat;

                    this.layer.refresh();

                    zs ++;

                    if( zs >= 60 ){

                        clearInterval(zstimer);

                        i++;

//                        zs = 1;

                        if( path[i] ) {

                            debugger;

                            pathTimer();

                        }

                    }

                }.bind(this),17)

//                i++;

//

            }.bind(this);

            pathTimer();

        }