// 地图视野发生变化时

bindRegion: function(e){

    if (e.type == "end"){

        this.mapCtx.getCenterLocation({

            success: res => {

                console.log(res);

                this.setData({

                latitude: res.latitude,

                longitude: res.longitude,

                });

            },

            fail: res => {

                console.log(res);

            }

        });

    }

},

地图视野发生变化时，获取当前中心的坐标就会一直执行getCenterLocation,我只拖动了一下，但是反复执行了无数次