近日项目需求，开始着手学习基于arcgis地图的开发，一些地图上的基本操作则是第一步。
地图上绘制点时碰见一个一个小bug，不知道怎样解除click的监听，导致每点击一个地图就会出现一个圆点，网上资料不好找，不过最终解决了，Mark一下跟大家分享。(^▽^)

back.drawPoint = function(){
    var events = back.view.on("click",function(event){
        console.log(event.mapPoint);
        var lat =  event.mapPoint.latitude;
        var lon =  event.mapPoint.longitude;
        var point = new Point({
            longitude: lon,
            latitude: lat
        });
        // Create a symbol for drawing the point
        var markerSymbol = new SimpleMarkerSymbol({
        color: [255, 0, 0],
        outline: { // autocasts as new SimpleLineSymbol()
          color: [0, 0, 0],
          width: 1
        }
      });

      var pointGraphic = new Graphic({
        geometry: point,
        symbol: markerSymbol
      });

      back.view.graphics.addMany([pointGraphic]);   
      events.remove();
    })
}

用的arcgis 4.4版本，back.view即mapview对象。