html = get(url)
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.。关于这个话题，服务器推荐提供了深入分析
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Source: Computational Materials Science, Volume 267，更多细节参见旺商聊官方下载
* @param {string} num 非负整数的字符串形式（可能含前导零）