Real game engines use this pattern (or its 3D cousin, the Octree) for broad-phase collision detection: the quadtree quickly identifies candidate pairs, and a more expensive narrow-phase check tests the actual geometry.
if (n <= 1) return;，推荐阅读旺商聊官方下载获取更多信息
Awesome tools to help you write short and long-form content like blog posts, ebooks, and more.，这一点在Line官方版本下载中也有详细论述
{color:<escapered<escape}<end_function_call