使用产品：iserver 8c 2007 操作系统：win10 64
数据类型：mysql 5.7
问题详细描述：地图绘制多个扇形区域，鼠标指在某些位置时滚动滚轮放大地图会报错，导致其他图层没有放大
报错内容：Uncaught TypeError: a.equals is not a function
at initialize.addComponent (eval at <anonymous> (SuperMap-8.1.1-14426.js:3), <anonymous>:1:347290)
at initialize.addComponents (eval at <anonymous> (SuperMap-8.1.1-14426.js:3), <anonymous>:1:324313)
at initialize (eval at <anonymous> (SuperMap-8.1.1-14426.js:3), <anonymous>:1:323455)
at initialize (eval at <anonymous> (SuperMap-8.1.1-14426.js:3), <anonymous>:1:329546)
at initialize (eval at <anonymous> (SuperMap-8.1.1-14426.js:3), <anonymous>:1:329927)
at initialize (eval at <anonymous> (SuperMap-8.1.1-14426.js:3), <anonymous>:1:330675)
at new initialize (eval at <anonymous> (SuperMap-8.1.1-14426.js:3), <anonymous>:1:347185)
at Object.SuperMap.Util.clipPolygonRect (eval at <anonymous> (SuperMap-8.1.1-14426.js:1), <anonymous>:1:34551)
at Object.SuperMap.Util.clipGeometryRect (eval at <anonymous> (SuperMap-8.1.1-14426.js:1), <anonymous>:1:35770)
at initialize.drawFeature (eval at <anonymous> (SuperMap-8.1.1-14426.js:3), <anonymous>:1:444440)
问题重现步骤：
1.创建图层绘制多个半径4公里，范围120度，方向-180至180不定的扇形区域；
2.创建图层在扇形的尖角坐标处标注小图标；
3.鼠标放在不同位置反复滚动滚轮进行放大缩小操作；
