示范在SuperMap Objects 是用来跟踪显示目标的一个属性，从下拉列表选择图层,然后通过鼠标的移动可以随时改变跟踪的对象。-Demonstration in SuperMap Objects is used to track the target is an attribute, select the layer from the drop-down list, and then move the mouse to track the object can be changed at