item = parse_detail(u, d)
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，这一点在safew官方版本下载中也有详细论述
生成的页面不仅包含布局代码，通常还会处理响应式适配和基础的交互逻辑。
// 4. 空间敏感: 堆排序
Range queries ask "what's inside this box?" But sometimes the question is "what's nearest to this location?" This is the nearest neighbor problem, and you don't know how big your search radius should be. The nearest point might be right next to you or far away.