arcgis for js基础缩放和定位功能

引用了两个包
'esri/widgets/Zoom'

var zoom = new Zoom({
  view: this.view
});
zoom.zoomOut(); 

var zoom = new Zoom({
  view: this.view
});
zoom.zoomIn(); 

视角定位
"esri/geometry/Point"

let pt = new Point(点位);
this.view.goTo(pt)