You can draw three types of hotspots: rectangles, ellipses, and polygons. When you click a hotspot, the URL is opened in the browser window or frame that you specify. You can also specify the text that appears when your mouse rests on the hotspot.
可以绘制三种类型的热点：矩形、椭圆和多边形。当单击某个热点时，会在指定的浏览器窗口或框架中打开 URL。也可以指定当鼠标停留在热点上时显示的文字。