- Allow user to specify the anchor positions (horizontal and vertical) for the icon relative to the canvas (default: center and center)
// console.log(spanner.next(80)); // 输出1（正确）
，详情可参考旺商聊官方下载
（二）具有网络虚拟定位功能的；
Games and physics simulations need to detect which objects are touching or overlapping. With nnn objects, checking every pair is O(n2)O(n^2)O(n2) comparisons, which gets expensive fast. A hundred objects means roughly 5,000 pair checks. A thousand means nearly 500,000.